diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index d8fd4d64..7047e2fa 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -57,7 +57,7 @@ You can also publish the built version to the site-build repository. This assume
 
 ### Testing
 
-Our tests are based on [QUnit](http://qunitjs.com/) and [PhantomJS](http://phantomjs.org/); they're both installed when you run `npm install`. To run on the command line:
+Our tests are based on [QUnit](http://qunitjs.com/) and [Puppeteer](https://github.com/GoogleChrome/puppeteer); they're both installed when you run `npm install`. To run on the command line:
 
     grunt test
 
diff --git a/Gruntfile.js b/Gruntfile.js
index 1658f83f..26eaa038 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -171,7 +171,6 @@ module.exports = function(grunt) {
                         baseUrl: '.',
                         disposeCollector: true
                     },
-                    inject: 'test/helpers/phantom-bridge.js',
                     timeout: 10000
                 }
             },
diff --git a/package-lock.json b/package-lock.json
index 229094a4..71d560ce 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "openseadragon",
-  "version": "2.4.0",
+  "version": "2.4.1",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -16,7 +16,7 @@
       "integrity": "sha1-hiRnWMfdbSGmR0/whKR0DsBesh8=",
       "dev": true,
       "requires": {
-        "mime-types": "2.1.17",
+        "mime-types": "~2.1.16",
         "negotiator": "0.6.1"
       }
     },
@@ -32,7 +32,7 @@
       "integrity": "sha1-r9+UiPsezvyDSPb7IvRk4ypYs2s=",
       "dev": true,
       "requires": {
-        "acorn": "3.3.0"
+        "acorn": "^3.0.4"
       },
       "dependencies": {
         "acorn": {
@@ -43,16 +43,25 @@
         }
       }
     },
+    "agent-base": {
+      "version": "4.3.0",
+      "resolved": "https://registry.npmjs.org/agent-base/-/agent-base-4.3.0.tgz",
+      "integrity": "sha512-salcGninV0nPrwpGNn4VTXBb1SOuXQBiqbrNXoeizJsHrsL6ERFM2Ne3JUSBWRE6aeNJI2ROP/WEEIDUiDe3cg==",
+      "dev": true,
+      "requires": {
+        "es6-promisify": "^5.0.0"
+      }
+    },
     "ajv": {
       "version": "5.5.2",
       "resolved": "https://registry.npmjs.org/ajv/-/ajv-5.5.2.tgz",
       "integrity": "sha1-c7Xuyj+rZT49P5Qis0GtQiBdyWU=",
       "dev": true,
       "requires": {
-        "co": "4.6.0",
-        "fast-deep-equal": "1.0.0",
-        "fast-json-stable-stringify": "2.0.0",
-        "json-schema-traverse": "0.3.1"
+        "co": "^4.6.0",
+        "fast-deep-equal": "^1.0.0",
+        "fast-json-stable-stringify": "^2.0.0",
+        "json-schema-traverse": "^0.3.0"
       }
     },
     "ajv-keywords": {
@@ -66,10 +75,11 @@
       "resolved": "https://registry.npmjs.org/align-text/-/align-text-0.1.4.tgz",
       "integrity": "sha1-DNkKVhCT810KmSVsIrcGlDP60Rc=",
       "dev": true,
+      "optional": true,
       "requires": {
-        "kind-of": "3.2.2",
-        "longest": "1.0.1",
-        "repeat-string": "1.6.1"
+        "kind-of": "^3.0.2",
+        "longest": "^1.0.1",
+        "repeat-string": "^1.5.2"
       }
     },
     "amdefine": {
@@ -102,63 +112,70 @@
       "integrity": "sha512-0XNayC8lTHQ2OI8aljNCN3sSx6hsr/1+rlcDAotXJR7C1oZZHCNsfpbKwMjRA3Uqb5tF1Rae2oloTr4xpq+WjA==",
       "dev": true,
       "requires": {
-        "micromatch": "2.3.11",
-        "normalize-path": "2.1.1"
+        "micromatch": "^2.1.5",
+        "normalize-path": "^2.0.0"
       }
     },
     "aproba": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/aproba/-/aproba-1.2.0.tgz",
       "integrity": "sha512-Y9J6ZjXtoYh8RnXVCMOU/ttDmk1aBjunq9vO0ta5x85WDQiQfUF9sIPBITdbiiIVcBo03Hi3jMxigBtsddlXRw==",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "are-we-there-yet": {
       "version": "1.1.4",
       "resolved": "https://registry.npmjs.org/are-we-there-yet/-/are-we-there-yet-1.1.4.tgz",
       "integrity": "sha1-u13KOCu5TwXhUZQ3PRb9O6HKEQ0=",
       "dev": true,
+      "optional": true,
       "requires": {
-        "delegates": "1.0.0",
-        "readable-stream": "2.3.6"
+        "delegates": "^1.0.0",
+        "readable-stream": "^2.0.6"
       },
       "dependencies": {
         "core-util-is": {
           "version": "1.0.2",
           "resolved": "https://registry.npmjs.org/core-util-is/-/core-util-is-1.0.2.tgz",
           "integrity": "sha1-tf1UIgqivFq1eqtxQMlAdUUDwac=",
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "inherits": {
           "version": "2.0.3",
           "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.3.tgz",
           "integrity": "sha1-Yzwsg+PaQqUC9SRmAiSA9CCCYd4=",
-          "dev": true
+          "dev": true,
+          "optional": true
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           "resolved": "https://registry.npmjs.org/isarray/-/isarray-1.0.0.tgz",
           "integrity": "sha1-u5NdSFgsuhaMBoNJV6VKPgcSTxE=",
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "process-nextick-args": {
           "version": "2.0.0",
           "resolved": "https://registry.npmjs.org/process-nextick-args/-/process-nextick-args-2.0.0.tgz",
           "integrity": "sha512-MtEC1TqN0EU5nephaJ4rAtThHtC86dNN9qCuEhtshvpVBkAW5ZO7BASN9REnF9eoXGcRub+pFuKEpOHE+HbEMw==",
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "readable-stream": {
           "version": "2.3.6",
           "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.3.6.tgz",
           "integrity": "sha512-tQtKA9WIAhBF3+VLAseyMqZeBjW0AHJoxOtYqSUZNJxauErmLbVm2FW1y+J/YA9dUrAC39ITejlZWhVIwawkKw==",
           "dev": true,
+          "optional": true,
           "requires": {
-            "core-util-is": "1.0.2",
-            "inherits": "2.0.3",
-            "isarray": "1.0.0",
-            "process-nextick-args": "2.0.0",
-            "safe-buffer": "5.1.1",
-            "string_decoder": "1.1.1",
-            "util-deprecate": "1.0.2"
+            "core-util-is": "~1.0.0",
+            "inherits": "~2.0.3",
+            "isarray": "~1.0.0",
+            "process-nextick-args": "~2.0.0",
+            "safe-buffer": "~5.1.1",
+            "string_decoder": "~1.1.1",
+            "util-deprecate": "~1.0.1"
           }
         },
         "string_decoder": {
@@ -166,15 +183,17 @@
           "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
           "integrity": "sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg==",
           "dev": true,
+          "optional": true,
           "requires": {
-            "safe-buffer": "5.1.1"
+            "safe-buffer": "~5.1.0"
           }
         },
         "util-deprecate": {
           "version": "1.0.2",
           "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
           "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=",
-          "dev": true
+          "dev": true,
+          "optional": true
         }
       }
     },
@@ -184,7 +203,7 @@
       "integrity": "sha1-c9g7wmP4bpf4zE9rrhsOkKfSLIY=",
       "dev": true,
       "requires": {
-        "sprintf-js": "1.0.3"
+        "sprintf-js": "~1.0.2"
       }
     },
     "arr-diff": {
@@ -193,7 +212,7 @@
       "integrity": "sha1-jzuCf5Vai9ZpaX5KQlasPOrjVs8=",
       "dev": true,
       "requires": {
-        "arr-flatten": "1.1.0"
+        "arr-flatten": "^1.0.1"
       }
     },
     "arr-flatten": {
@@ -202,6 +221,12 @@
       "integrity": "sha512-L3hKV5R/p5o81R7O02IGnwpDmkp6E982XhtbuwSe3O4qOtMMMtodicASA1Cny2U+aCXcNpml+m4dPsvsJ3jatg==",
       "dev": true
     },
+    "arr-union": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/arr-union/-/arr-union-3.1.0.tgz",
+      "integrity": "sha1-45sJrqne+Gao8gbiiK9jkZuuOcQ=",
+      "dev": true
+    },
     "array-find-index": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/array-find-index/-/array-find-index-1.0.2.tgz",
@@ -218,12 +243,20 @@
       "version": "0.2.3",
       "resolved": "https://registry.npmjs.org/asn1/-/asn1-0.2.3.tgz",
       "integrity": "sha1-2sh4dxPJlmhJ/IGAd36+nB3fO4Y=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "assert-plus": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/assert-plus/-/assert-plus-1.0.0.tgz",
       "integrity": "sha1-8S4PPF13sLHN2RRpQuTpbB5N1SU=",
+      "dev": true,
+      "optional": true
+    },
+    "assign-symbols": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/assign-symbols/-/assign-symbols-1.0.0.tgz",
+      "integrity": "sha1-WWZ/QfrdTyDMvCu5a41Pf3jsA2c=",
       "dev": true
     },
     "async": {
@@ -233,28 +266,43 @@
       "dev": true
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     "async-each": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/async-each/-/async-each-1.0.1.tgz",
-      "integrity": "sha1-GdOGodntxufByF04iu28xW0zYC0=",
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/async-each/-/async-each-1.0.3.tgz",
+      "integrity": "sha512-z/WhQ5FPySLdvREByI2vZiTWwCnF0moMJ1hK9YQwDTHKh6I7/uSckMetoRGb5UBZPC1z0jlw+n/XCgjeH7y1AQ==",
+      "dev": true
+    },
+    "async-limiter": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/async-limiter/-/async-limiter-1.0.0.tgz",
+      "integrity": "sha512-jp/uFnooOiO+L211eZOoSyzpOITMXx1rBITauYykG3BRYPu8h0UcxsPNB04RR5vo4Tyz3+ay17tR6JVf9qzYWg==",
       "dev": true
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     "asynckit": {
       "version": "0.4.0",
       "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
       "integrity": "sha1-x57Zf380y48robyXkLzDZkdLS3k=",
+      "dev": true,
+      "optional": true
+    },
+    "atob": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/atob/-/atob-2.1.2.tgz",
+      "integrity": "sha512-Wm6ukoaOGJi/73p/cl2GvLjTI5JM1k/O14isD73YML8StrH/7/lRFgmg8nICZgD3bZZvjwCGxtMOD3wWNAu8cg==",
       "dev": true
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     "aws-sign2": {
       "version": "0.7.0",
       "resolved": "https://registry.npmjs.org/aws-sign2/-/aws-sign2-0.7.0.tgz",
       "integrity": "sha1-tG6JCTSpWR8tL2+G1+ap8bP+dqg=",
-      "dev": true
+      "dev": true,
+      "optional": true
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     "aws4": {
       "version": "1.6.0",
       "resolved": "https://registry.npmjs.org/aws4/-/aws4-1.6.0.tgz",
       "integrity": "sha1-g+9cqGCysy5KDe7e6MdxudtXRx4=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "babel-code-frame": {
       "version": "6.26.0",
@@ -262,9 +310,9 @@
       "integrity": "sha1-Y/1D99weO7fONZR9uP42mj9Yx0s=",
       "dev": true,
       "requires": {
-        "chalk": "1.1.3",
-        "esutils": "2.0.2",
-        "js-tokens": "3.0.2"
+        "chalk": "^1.1.3",
+        "esutils": "^2.0.2",
+        "js-tokens": "^3.0.2"
       },
       "dependencies": {
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@@ -273,11 +321,11 @@
           "integrity": "sha1-qBFcVeSnAv5NFQq9OHKCKn4J/Jg=",
           "dev": true,
           "requires": {
-            "ansi-styles": "2.2.1",
-            "escape-string-regexp": "1.0.5",
-            "has-ansi": "2.0.0",
-            "strip-ansi": "3.0.1",
-            "supports-color": "2.0.0"
+            "ansi-styles": "^2.2.1",
+            "escape-string-regexp": "^1.0.2",
+            "has-ansi": "^2.0.0",
+            "strip-ansi": "^3.0.0",
+            "supports-color": "^2.0.0"
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       }
@@ -288,6 +336,73 @@
       "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c=",
       "dev": true
     },
+    "base": {
+      "version": "0.11.2",
+      "resolved": "https://registry.npmjs.org/base/-/base-0.11.2.tgz",
+      "integrity": "sha512-5T6P4xPgpp0YDFvSWwEZ4NoE3aM4QBQXDzmVbraCkFj8zHM+mba8SyqB5DbZWyR7mYHo6Y7BdQo3MoA4m0TeQg==",
+      "dev": true,
+      "requires": {
+        "cache-base": "^1.0.1",
+        "class-utils": "^0.3.5",
+        "component-emitter": "^1.2.1",
+        "define-property": "^1.0.0",
+        "isobject": "^3.0.1",
+        "mixin-deep": "^1.2.0",
+        "pascalcase": "^0.1.1"
+      },
+      "dependencies": {
+        "define-property": {
+          "version": "1.0.0",
+          "resolved": "https://registry.npmjs.org/define-property/-/define-property-1.0.0.tgz",
+          "integrity": "sha1-dp66rz9KY6rTr56NMEybvnm/sOY=",
+          "dev": true,
+          "requires": {
+            "is-descriptor": "^1.0.0"
+          }
+        },
+        "is-accessor-descriptor": {
+          "version": "1.0.0",
+          "resolved": "https://registry.npmjs.org/is-accessor-descriptor/-/is-accessor-descriptor-1.0.0.tgz",
+          "integrity": "sha512-m5hnHTkcVsPfqx3AKlyttIPb7J+XykHvJP2B9bZDjlhLIoEq4XoK64Vg7boZlVWYK6LUY94dYPEE7Lh0ZkZKcQ==",
+          "dev": true,
+          "requires": {
+            "kind-of": "^6.0.0"
+          }
+        },
+        "is-data-descriptor": {
+          "version": "1.0.0",
+          "resolved": "https://registry.npmjs.org/is-data-descriptor/-/is-data-descriptor-1.0.0.tgz",
+          "integrity": "sha512-jbRXy1FmtAoCjQkVmIVYwuuqDFUbaOeDjmed1tOGPrsMhtJA4rD9tkgA0F1qJ3gRFRXcHYVkdeaP50Q5rE/jLQ==",
+          "dev": true,
+          "requires": {
+            "kind-of": "^6.0.0"
+          }
+        },
+        "is-descriptor": {
+          "version": "1.0.2",
+          "resolved": "https://registry.npmjs.org/is-descriptor/-/is-descriptor-1.0.2.tgz",
+          "integrity": "sha512-2eis5WqQGV7peooDyLmNEPUrps9+SXX5c9pL3xEB+4e9HnGuDa7mB7kHxHw4CbqS9k1T2hOH3miL8n8WtiYVtg==",
+          "dev": true,
+          "requires": {
+            "is-accessor-descriptor": "^1.0.0",
+            "is-data-descriptor": "^1.0.0",
+            "kind-of": "^6.0.2"
+          }
+        },
+        "isobject": {
+          "version": "3.0.1",
+          "resolved": "https://registry.npmjs.org/isobject/-/isobject-3.0.1.tgz",
+          "integrity": "sha1-TkMekrEalzFjaqH5yNHMvP2reN8=",
+          "dev": true
+        },
+        "kind-of": {
+          "version": "6.0.2",
+          "resolved": "https://registry.npmjs.org/kind-of/-/kind-of-6.0.2.tgz",
+          "integrity": "sha512-s5kLOcnH0XqDO+FvuaLX8DDjZ18CGFk7VygH40QoKPUQhW4e2rvM0rwUq0t8IQDOwYSeLK01U90OjzBTme2QqA==",
+          "dev": true
+        }
+      }
+    },
     "basic-auth": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/basic-auth/-/basic-auth-2.0.0.tgz",
@@ -310,13 +425,13 @@
       "dev": true,
       "optional": true,
       "requires": {
-        "tweetnacl": "0.14.5"
+        "tweetnacl": "^0.14.3"
       }
     },
     "binary-extensions": {
-      "version": "1.11.0",
-      "resolved": "https://registry.npmjs.org/binary-extensions/-/binary-extensions-1.11.0.tgz",
-      "integrity": "sha1-RqoXUftqL5PuXmibsQh9SxTGwgU=",
+      "version": "1.13.1",
+      "resolved": "https://registry.npmjs.org/binary-extensions/-/binary-extensions-1.13.1.tgz",
+      "integrity": "sha512-Un7MIEDdUC5gNpcGDV97op1Ywk748MpHcFTHoYs6qnj1Z3j7I53VG3nwZhKzoBZmbdRNnb6WRdFlwl7tSDuZGw==",
       "dev": true
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@@ -326,7 +441,7 @@
       "dev": true,
       "optional": true,
       "requires": {
-        "inherits": "2.0.3"
+        "inherits": "~2.0.0"
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@@ -344,10 +459,10 @@
       "integrity": "sha1-5LoM5BCkaTYyM2dgnstOZVMSUGk=",
       "dev": true,
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-        "error": "7.0.2",
-        "raw-body": "1.1.7",
-        "safe-json-parse": "1.0.1"
+        "continuable-cache": "^0.3.1",
+        "error": "^7.0.0",
+        "raw-body": "~1.1.0",
+        "safe-json-parse": "~1.0.1"
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@@ -355,8 +470,9 @@
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       "integrity": "sha1-T4owBctKfjiJ90kDD9JbluAdLjE=",
       "dev": true,
+      "optional": true,
       "requires": {
-        "hoek": "4.2.1"
+        "hoek": "4.x.x"
       }
     },
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@@ -365,7 +481,7 @@
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       "dev": true,
       "requires": {
-        "balanced-match": "1.0.0",
+        "balanced-match": "^1.0.0",
         "concat-map": "0.0.1"
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@@ -375,9 +491,9 @@
       "integrity": "sha1-uneWLhLf+WnWt2cR6RS3N4V79qc=",
       "dev": true,
       "requires": {
-        "expand-range": "1.8.2",
-        "preserve": "0.2.0",
-        "repeat-element": "1.1.2"
+        "expand-range": "^1.8.1",
+        "preserve": "^0.2.0",
+        "repeat-element": "^1.1.2"
       }
     },
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@@ -386,8 +502,8 @@
       "integrity": "sha1-BVFNM78WVtNUDGhPZbEgLpDsowM=",
       "dev": true,
       "requires": {
-        "buffer-alloc-unsafe": "0.1.1",
-        "buffer-fill": "0.1.1"
+        "buffer-alloc-unsafe": "^0.1.0",
+        "buffer-fill": "^0.1.0"
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@@ -402,6 +518,12 @@
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       "dev": true
     },
+    "buffer-from": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/buffer-from/-/buffer-from-1.1.1.tgz",
+      "integrity": "sha512-MQcXEUbCKtEo7bhqEs6560Hyd4XaovZlO/k9V3hjVUF/zwW7KBVdSK4gIt/bzwS9MbR5qob+F5jusZsb0YQK2A==",
+      "dev": true
+    },
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-          "dev": true,
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-          "version": "4.6.0",
+        "chownr": {
+          "version": "1.1.1",
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           "optional": true
@@ -1617,75 +1832,41 @@
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-          "version": "1.0.5",
-          "bundled": true,
           "dev": true,
-          "requires": {
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-          }
+          "optional": true
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           "version": "0.0.1",
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           "optional": true
         },
-        "delayed-stream": {
-          "version": "1.0.0",
+        "debug": {
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+          }
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+          "optional": true
         },
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           "version": "1.0.0",
@@ -1694,74 +1875,25 @@
           "optional": true
         },
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-          "version": "1.0.2",
+          "version": "1.0.3",
           "bundled": true,
           "dev": true,
           "optional": true
         },
-        "ecc-jsbn": {
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-          }
+          "optional": true
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@@ -1769,65 +1901,28 @@
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-              "bundled": true,
-              "dev": true,
-              "optional": true
-            }
+            "aproba": "^1.0.3",
+            "console-control-strings": "^1.0.0",
+            "has-unicode": "^2.0.0",
+            "object-assign": "^4.1.0",
+            "signal-exit": "^3.0.0",
+            "string-width": "^1.0.1",
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-          "optional": true
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-          "version": "4.2.1",
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           "bundled": true,
           "dev": true,
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           "requires": {
-            "ajv": "4.11.8",
-            "har-schema": "1.0.5"
+            "fs.realpath": "^1.0.0",
+            "inflight": "^1.0.4",
+            "inherits": "2",
+            "minimatch": "^3.0.4",
+            "once": "^1.3.0",
+            "path-is-absolute": "^1.0.0"
           }
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@@ -1836,49 +1931,42 @@
           "dev": true,
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-          "dev": true
-        },
-        "http-signature": {
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+        "iconv-lite": {
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           "optional": true,
           "requires": {
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-            "jsprim": "1.4.0",
-            "sshpk": "1.13.0"
+            "safer-buffer": ">= 2.1.2 < 3"
+          }
+        },
+        "ignore-walk": {
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+          "dev": true,
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+          "requires": {
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           }
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           "version": "1.0.6",
           "bundled": true,
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-            "once": "1.4.0",
-            "wrappy": "1.0.2"
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           }
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           "version": "2.0.3",
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         },
         "ini": {
-          "version": "1.3.4",
+          "version": "1.3.5",
           "bundled": true,
           "dev": true,
           "optional": true
@@ -1887,146 +1975,93 @@
           "version": "1.0.0",
           "bundled": true,
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           "requires": {
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+            "number-is-nan": "^1.0.0"
           }
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           "version": "3.0.4",
           "bundled": true,
           "dev": true,
+          "optional": true,
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+            "brace-expansion": "^1.1.7"
           }
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         "minimist": {
           "version": "0.0.8",
           "bundled": true,
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+          "dev": true,
+          "optional": true,
+          "requires": {
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+            "yallist": "^3.0.0"
+          }
+        },
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+          "bundled": true,
+          "dev": true,
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+          "requires": {
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         "mkdirp": {
           "version": "0.5.1",
           "bundled": true,
           "dev": true,
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           "requires": {
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           }
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         "ms": {
-          "version": "2.0.0",
+          "version": "2.1.1",
           "bundled": true,
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-        "node-pre-gyp": {
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+        "needle": {
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-            "rimraf": "2.6.1",
-            "semver": "5.3.0",
-            "tar": "2.2.1",
-            "tar-pack": "3.4.0"
+            "debug": "^4.1.0",
+            "iconv-lite": "^0.4.4",
+            "sax": "^1.2.4"
+          }
+        },
+        "node-pre-gyp": {
+          "version": "0.12.0",
+          "bundled": true,
+          "dev": true,
+          "optional": true,
+          "requires": {
+            "detect-libc": "^1.0.2",
+            "mkdirp": "^0.5.1",
+            "needle": "^2.2.1",
+            "nopt": "^4.0.1",
+            "npm-packlist": "^1.1.6",
+            "npmlog": "^4.0.2",
+            "rc": "^1.2.7",
+            "rimraf": "^2.6.1",
+            "semver": "^5.3.0",
+            "tar": "^4"
           }
         },
         "nopt": {
@@ -2035,30 +2070,41 @@
           "dev": true,
           "optional": true,
           "requires": {
-            "abbrev": "1.1.0",
-            "osenv": "0.1.4"
+            "abbrev": "1",
+            "osenv": "^0.1.4"
           }
         },
-        "npmlog": {
-          "version": "4.1.0",
+        "npm-bundled": {
+          "version": "1.0.6",
+          "bundled": true,
+          "dev": true,
+          "optional": true
+        },
+        "npm-packlist": {
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           "bundled": true,
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-            "console-control-strings": "1.1.0",
-            "gauge": "2.7.4",
-            "set-blocking": "2.0.0"
+            "ignore-walk": "^3.0.1",
+            "npm-bundled": "^1.0.1"
+          }
+        },
+        "npmlog": {
+          "version": "4.1.2",
+          "bundled": true,
+          "dev": true,
+          "optional": true,
+          "requires": {
+            "are-we-there-yet": "~1.1.2",
+            "console-control-strings": "~1.1.0",
+            "gauge": "~2.7.3",
+            "set-blocking": "~2.0.0"
           }
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           "optional": true
         },
@@ -2072,8 +2118,9 @@
           "version": "1.4.0",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
-            "wrappy": "1.0.2"
+            "wrappy": "1"
           }
         },
         "os-homedir": {
@@ -2089,53 +2136,37 @@
           "optional": true
         },
         "osenv": {
-          "version": "0.1.4",
+          "version": "0.1.5",
           "bundled": true,
           "dev": true,
           "optional": true,
           "requires": {
-            "os-homedir": "1.0.2",
-            "os-tmpdir": "1.0.2"
+            "os-homedir": "^1.0.0",
+            "os-tmpdir": "^1.0.0"
           }
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-          "bundled": true,
-          "dev": true,
-          "optional": true
-        },
-        "qs": {
-          "version": "6.4.0",
+          "version": "2.0.0",
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           "optional": true
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-          "version": "1.2.1",
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@@ -2614,6 +2571,12 @@
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       "integrity": "sha1-f17oI66AUgfACvLfSoTsP8+lcLQ=",
       "dev": true
     },
-    "throttleit": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/throttleit/-/throttleit-1.0.0.tgz",
-      "integrity": "sha1-nnhYNtr0Z0MUWlmEtiaNgoUorGw=",
-      "dev": true
-    },
     "through": {
       "version": "2.3.8",
       "resolved": "http://registry.npmjs.org/through/-/through-2.3.8.tgz",
@@ -5991,12 +6789,12 @@
       "integrity": "sha512-44yhA3tsaRoMOjQQ+5v5mVdqef+kH6Qze9jTpqtVufgYjYt08zyZAwNwwVBj3i1rJMnR52IxOW0LK0vBzgAkuA==",
       "dev": true,
       "requires": {
-        "body": "5.1.0",
-        "debug": "3.1.0",
-        "faye-websocket": "0.10.0",
-        "livereload-js": "2.3.0",
-        "object-assign": "4.1.1",
-        "qs": "6.5.1"
+        "body": "^5.1.0",
+        "debug": "^3.1.0",
+        "faye-websocket": "~0.10.0",
+        "livereload-js": "^2.3.0",
+        "object-assign": "^4.1.0",
+        "qs": "^6.4.0"
       }
     },
     "tmp": {
@@ -6005,7 +6803,7 @@
       "integrity": "sha512-jRCJlojKnZ3addtTOjdIqoRuPEKBvNXcGYqzO6zWZX8KfKEpnGY5jfggJQ3EjKuu8D4bJRr0y+cYJFmYbImXGw==",
       "dev": true,
       "requires": {
-        "os-tmpdir": "1.0.2"
+        "os-tmpdir": "~1.0.2"
       }
     },
     "to-buffer": {
@@ -6014,13 +6812,56 @@
       "integrity": "sha512-lx9B5iv7msuFYE3dytT+KE5tap+rNYw+K4jVkb9R/asAb+pbBSM17jtunHplhBe6RRJdZx3Pn2Jph24O32mOVg==",
       "dev": true
     },
+    "to-object-path": {
+      "version": "0.3.0",
+      "resolved": "https://registry.npmjs.org/to-object-path/-/to-object-path-0.3.0.tgz",
+      "integrity": "sha1-KXWIt7Dn4KwI4E5nL4XB9JmeF68=",
+      "dev": true,
+      "requires": {
+        "kind-of": "^3.0.2"
+      }
+    },
+    "to-regex": {
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/to-regex/-/to-regex-3.0.2.tgz",
+      "integrity": "sha512-FWtleNAtZ/Ki2qtqej2CXTOayOH9bHDQF+Q48VpWyDXjbYxA4Yz8iDB31zXOBUlOHHKidDbqGVrTUvQMPmBGBw==",
+      "dev": true,
+      "requires": {
+        "define-property": "^2.0.2",
+        "extend-shallow": "^3.0.2",
+        "regex-not": "^1.0.2",
+        "safe-regex": "^1.1.0"
+      }
+    },
+    "to-regex-range": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/to-regex-range/-/to-regex-range-2.1.1.tgz",
+      "integrity": "sha1-fIDBe53+vlmeJzZ+DU3VWQFB2zg=",
+      "dev": true,
+      "requires": {
+        "is-number": "^3.0.0",
+        "repeat-string": "^1.6.1"
+      },
+      "dependencies": {
+        "is-number": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/is-number/-/is-number-3.0.0.tgz",
+          "integrity": "sha1-JP1iAaR4LPUFYcgQJ2r8fRLXEZU=",
+          "dev": true,
+          "requires": {
+            "kind-of": "^3.0.2"
+          }
+        }
+      }
+    },
     "tough-cookie": {
       "version": "2.3.3",
       "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-2.3.3.tgz",
       "integrity": "sha1-C2GKVWW23qkL80JdBNVe3EdadWE=",
       "dev": true,
+      "optional": true,
       "requires": {
-        "punycode": "1.4.1"
+        "punycode": "^1.4.1"
       }
     },
     "trim-newlines": {
@@ -6034,8 +6875,9 @@
       "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
       "integrity": "sha1-J6XeoGs2sEoKmWZ3SykIaPD8QP0=",
       "dev": true,
+      "optional": true,
       "requires": {
-        "safe-buffer": "5.1.1"
+        "safe-buffer": "^5.0.1"
       }
     },
     "tweetnacl": {
@@ -6051,7 +6893,7 @@
       "integrity": "sha1-WITKtRLPHTVeP7eE8wgEsrUg23I=",
       "dev": true,
       "requires": {
-        "prelude-ls": "1.1.2"
+        "prelude-ls": "~1.1.2"
       }
     },
     "typedarray": {
@@ -6066,8 +6908,8 @@
       "integrity": "sha512-8CJsbKOtEbnJsTyv6LE6m6ZKniqMiFWmm9sRbopbkGs3gMPPfd3Fh8iIA4Ykv5MgaTbqHr4BaoGLJLZNhsrW1Q==",
       "dev": true,
       "requires": {
-        "commander": "2.17.1",
-        "source-map": "0.6.1"
+        "commander": "~2.17.1",
+        "source-map": "~0.6.1"
       }
     },
     "uglify-to-browserify": {
@@ -6083,8 +6925,20 @@
       "integrity": "sha512-g+dpmgn+XBneLmXXo+sGlW5xQEt4ErkS3mgeN2GFbremYeMBSJKr9Wf2KJplQVaiPY/f7FN6atosWYNm9ovrYg==",
       "dev": true,
       "requires": {
-        "sprintf-js": "1.0.3",
-        "util-deprecate": "1.0.2"
+        "sprintf-js": "^1.0.3",
+        "util-deprecate": "^1.0.2"
+      }
+    },
+    "union-value": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/union-value/-/union-value-1.0.1.tgz",
+      "integrity": "sha512-tJfXmxMeWYnczCVs7XAEvIV7ieppALdyepWMkHkwciRpZraG/xwT+s2JN8+pr1+8jCRf80FFzvr+MpQeeoF4Xg==",
+      "dev": true,
+      "requires": {
+        "arr-union": "^3.1.0",
+        "get-value": "^2.0.6",
+        "is-extendable": "^0.1.1",
+        "set-value": "^2.0.1"
       }
     },
     "unpipe": {
@@ -6093,12 +6947,70 @@
       "integrity": "sha1-sr9O6FFKrmFltIF4KdIbLvSZBOw=",
       "dev": true
     },
+    "unset-value": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/unset-value/-/unset-value-1.0.0.tgz",
+      "integrity": "sha1-g3aHP30jNRef+x5vw6jtDfyKtVk=",
+      "dev": true,
+      "requires": {
+        "has-value": "^0.3.1",
+        "isobject": "^3.0.0"
+      },
+      "dependencies": {
+        "has-value": {
+          "version": "0.3.1",
+          "resolved": "https://registry.npmjs.org/has-value/-/has-value-0.3.1.tgz",
+          "integrity": "sha1-ex9YutpiyoJ+wKIHgCVlSEWZXh8=",
+          "dev": true,
+          "requires": {
+            "get-value": "^2.0.3",
+            "has-values": "^0.1.4",
+            "isobject": "^2.0.0"
+          },
+          "dependencies": {
+            "isobject": {
+              "version": "2.1.0",
+              "resolved": "https://registry.npmjs.org/isobject/-/isobject-2.1.0.tgz",
+              "integrity": "sha1-8GVWEJaj8dou9GJy+BXIQNh+DIk=",
+              "dev": true,
+              "requires": {
+                "isarray": "1.0.0"
+              }
+            }
+          }
+        },
+        "has-values": {
+          "version": "0.1.4",
+          "resolved": "https://registry.npmjs.org/has-values/-/has-values-0.1.4.tgz",
+          "integrity": "sha1-bWHeldkd/Km5oCCJrThL/49it3E=",
+          "dev": true
+        },
+        "isobject": {
+          "version": "3.0.1",
+          "resolved": "https://registry.npmjs.org/isobject/-/isobject-3.0.1.tgz",
+          "integrity": "sha1-TkMekrEalzFjaqH5yNHMvP2reN8=",
+          "dev": true
+        }
+      }
+    },
     "uri-path": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/uri-path/-/uri-path-1.0.0.tgz",
       "integrity": "sha1-l0fwGDWJM8Md4PzP2C0TjmcmLjI=",
       "dev": true
     },
+    "urix": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/urix/-/urix-0.1.0.tgz",
+      "integrity": "sha1-2pN/emLiH+wf0Y1Js1wpNQZ6bHI=",
+      "dev": true
+    },
+    "use": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/use/-/use-3.1.1.tgz",
+      "integrity": "sha512-cwESVXlO3url9YWlFW/TA9cshCEhtu7IKJ/p5soJ/gGpj7vbvFrAY/eIioQ6Dw23KjZhYgiIo8HOs1nQ2vr/oQ==",
+      "dev": true
+    },
     "util-deprecate": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
@@ -6115,7 +7027,8 @@
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.1.0.tgz",
       "integrity": "sha512-DIWtzUkw04M4k3bf1IcpS2tngXEL26YUD2M0tMDUpnUrz2hgzUBlD55a4FjdLGPvfHxS6uluGWvaVEqgBcVa+g==",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "validate-npm-package-license": {
       "version": "3.0.4",
@@ -6123,8 +7036,8 @@
       "integrity": "sha512-DpKm2Ui/xN7/HQKCtpZxoRWBhZ9Z0kqtygG8XCgNQ8ZlDnxuQmWhj566j8fN4Cu3/JmbhsDo7fcAJq4s9h27Ew==",
       "dev": true,
       "requires": {
-        "spdx-correct": "3.1.0",
-        "spdx-expression-parse": "3.0.0"
+        "spdx-correct": "^3.0.0",
+        "spdx-expression-parse": "^3.0.0"
       }
     },
     "verror": {
@@ -6132,10 +7045,11 @@
       "resolved": "https://registry.npmjs.org/verror/-/verror-1.10.0.tgz",
       "integrity": "sha1-OhBcoXBTr1XW4nDB+CiGguGNpAA=",
       "dev": true,
+      "optional": true,
       "requires": {
-        "assert-plus": "1.0.0",
+        "assert-plus": "^1.0.0",
         "core-util-is": "1.0.2",
-        "extsprintf": "1.3.0"
+        "extsprintf": "^1.2.0"
       }
     },
     "walk-sync": {
@@ -6144,8 +7058,8 @@
       "integrity": "sha1-VYoWrqyMDbWcAotzxm85doTs5GU=",
       "dev": true,
       "requires": {
-        "ensure-posix-path": "1.0.2",
-        "matcher-collection": "1.0.5"
+        "ensure-posix-path": "^1.0.0",
+        "matcher-collection": "^1.0.0"
       }
     },
     "websocket-driver": {
@@ -6154,8 +7068,8 @@
       "integrity": "sha1-DK+dLXVdk67gSdS90NP+LMoqJOs=",
       "dev": true,
       "requires": {
-        "http-parser-js": "0.4.12",
-        "websocket-extensions": "0.1.3"
+        "http-parser-js": ">=0.4.0",
+        "websocket-extensions": ">=0.1.1"
       }
     },
     "websocket-extensions": {
@@ -6170,7 +7084,7 @@
       "integrity": "sha1-mofEN48D6CfOyvGs31bHNsAcFOU=",
       "dev": true,
       "requires": {
-        "isexe": "2.0.0"
+        "isexe": "^2.0.0"
       }
     },
     "which-pm-runs": {
@@ -6185,46 +7099,52 @@
       "resolved": "https://registry.npmjs.org/wide-align/-/wide-align-1.1.2.tgz",
       "integrity": "sha512-ijDLlyQ7s6x1JgCLur53osjm/UXUYD9+0PbYKrBsYisYXzCxN+HC3mYDNy/dWdmf3AwqwU3CXwDCvsNgGK1S0w==",
       "dev": true,
+      "optional": true,
       "requires": {
-        "string-width": "1.0.2"
+        "string-width": "^1.0.2"
       },
       "dependencies": {
         "ansi-regex": {
           "version": "2.1.1",
           "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
           "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "code-point-at": {
           "version": "1.1.0",
           "resolved": "https://registry.npmjs.org/code-point-at/-/code-point-at-1.1.0.tgz",
           "integrity": "sha1-DQcLTQQ6W+ozovGkDi7bPZpMz3c=",
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "is-fullwidth-code-point": {
           "version": "1.0.0",
           "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-1.0.0.tgz",
           "integrity": "sha1-754xOG8DGn8NZDr4L95QxFfvAMs=",
           "dev": true,
+          "optional": true,
           "requires": {
-            "number-is-nan": "1.0.1"
+            "number-is-nan": "^1.0.0"
           }
         },
         "number-is-nan": {
           "version": "1.0.1",
           "resolved": "https://registry.npmjs.org/number-is-nan/-/number-is-nan-1.0.1.tgz",
           "integrity": "sha1-CXtgK1NCKlIsGvuHkDGDNpQaAR0=",
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "string-width": {
           "version": "1.0.2",
           "resolved": "https://registry.npmjs.org/string-width/-/string-width-1.0.2.tgz",
           "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
           "dev": true,
+          "optional": true,
           "requires": {
-            "code-point-at": "1.1.0",
-            "is-fullwidth-code-point": "1.0.0",
-            "strip-ansi": "3.0.1"
+            "code-point-at": "^1.0.0",
+            "is-fullwidth-code-point": "^1.0.0",
+            "strip-ansi": "^3.0.0"
           }
         },
         "strip-ansi": {
@@ -6232,8 +7152,9 @@
           "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
           "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
           "dev": true,
+          "optional": true,
           "requires": {
-            "ansi-regex": "2.1.1"
+            "ansi-regex": "^2.0.0"
           }
         }
       }
@@ -6263,7 +7184,16 @@
       "integrity": "sha1-X8A4KOJkzqP+kUVUdvejxWbLB1c=",
       "dev": true,
       "requires": {
-        "mkdirp": "0.5.1"
+        "mkdirp": "^0.5.1"
+      }
+    },
+    "ws": {
+      "version": "6.2.1",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-6.2.1.tgz",
+      "integrity": "sha512-GIyAXC2cB7LjvpgMt9EKS2ldqr0MTrORaleiOno6TweZ6r3TKtoFQWay/2PceJ3RuBasOHzXNn5Lrw1X0bEjqA==",
+      "dev": true,
+      "requires": {
+        "async-limiter": "~1.0.0"
       }
     },
     "xtend": {
@@ -6285,9 +7215,9 @@
       "dev": true,
       "optional": true,
       "requires": {
-        "camelcase": "1.2.1",
-        "cliui": "2.1.0",
-        "decamelize": "1.2.0",
+        "camelcase": "^1.0.2",
+        "cliui": "^2.1.0",
+        "decamelize": "^1.0.0",
         "window-size": "0.1.0"
       },
       "dependencies": {
@@ -6306,7 +7236,7 @@
       "integrity": "sha1-lSj0QtqxsihOWLQ3m7GU4i4MQAU=",
       "dev": true,
       "requires": {
-        "fd-slicer": "1.0.1"
+        "fd-slicer": "~1.0.1"
       }
     }
   }
diff --git a/package.json b/package.json
index f99fe8a5..77425ea9 100644
--- a/package.json
+++ b/package.json
@@ -33,7 +33,7 @@
     "grunt-contrib-compress": "^1.4.3",
     "grunt-contrib-concat": "^1.0.1",
     "grunt-contrib-connect": "^1.0.2",
-    "grunt-contrib-qunit": "^2.0.0",
+    "grunt-contrib-qunit": "^3.1.0",
     "grunt-contrib-uglify": "^3.4.0",
     "grunt-contrib-watch": "^1.1.0",
     "grunt-eslint": "^20.2.0",
diff --git a/test/helpers/phantom-bridge.js b/test/helpers/phantom-bridge.js
deleted file mode 100644
index ed5b84ad..00000000
--- a/test/helpers/phantom-bridge.js
+++ /dev/null
@@ -1,73 +0,0 @@
-/*
- * grunt-contrib-qunit
- * http://gruntjs.com/
- *
- * Copyright (c) 2016 "Cowboy" Ben Alman, contributors
- * Licensed under the MIT license.
- */
-
-/*global QUnit:true, alert:true*/
-(function (factory) {
-  if (typeof define === 'function' && define.amd) {
-    require(['qunit'], factory);
-  } else {
-    factory(QUnit);
-  }
-}(function(QUnit) {
-  'use strict';
-
-  // Don't re-order tests.
-  QUnit.config.reorder = false;
-
-  // Send messages to the parent PhantomJS process via alert! Good times!!
-  function sendMessage() {
-    var args = [].slice.call(arguments);
-    alert(JSON.stringify(args));
-  }
-
-  // These methods connect QUnit to PhantomJS.
-  QUnit.log(function(obj) {
-    // What is this I don’t even
-    if (obj.message === '[object Object], undefined:undefined') { return; }
-
-    // Parse some stuff before sending it.
-    var actual, expected;
-    if (!obj.result) {
-      // Dumping large objects can be very slow, and the dump isn't used for
-      // passing tests, so only dump if the test failed.
-      actual = QUnit.dump.parse(obj.actual);
-      expected = QUnit.dump.parse(obj.expected);
-    }
-    // Send it.
-    sendMessage('qunit.log', obj.result, actual, expected, obj.message, obj.source, obj.todo);
-  });
-
-  QUnit.testStart(function(obj) {
-    sendMessage('qunit.testStart', obj.name);
-  });
-
-  QUnit.testDone(function(obj) {
-    sendMessage('qunit.testDone', obj.name, obj.failed, obj.passed, obj.total, obj.runtime, obj.skipped, obj.todo);
-  });
-
-  QUnit.moduleStart(function(obj) {
-    sendMessage('qunit.moduleStart', obj.name);
-  });
-
-  QUnit.moduleDone(function(obj) {
-    sendMessage('qunit.moduleDone', obj.name, obj.failed, obj.passed, obj.total);
-  });
-
-  QUnit.begin(function() {
-    sendMessage('qunit.begin');
-  });
-
-  QUnit.done(function(obj) {
-      // send coverage data if available
-      if ( window.__coverage__ ) {
-        sendMessage( "qunit.coverage", window.__coverage__ );
-      }
-
-      sendMessage('qunit.done', obj.failed, obj.passed, obj.total, obj.runtime);
-  });
-}));
diff --git a/test/modules/basic.js b/test/modules/basic.js
index 257246db..2eefd509 100644
--- a/test/modules/basic.js
+++ b/test/modules/basic.js
@@ -307,20 +307,6 @@
     // The Wikipedia logo has CORS enabled
     var corsImg = 'http://upload.wikimedia.org/wikipedia/en/b/bc/Wiki.png';
 
-    // PhantomJS always taint the canvas, so we only run some tests on browsers
-    // supporting CORS images.
-    function browserSupportsImgCrossOrigin(callback) {
-        var img = new Image();
-        img.crossOrigin = 'anonymous';
-        img.onload = function() {
-            var canvas = document.createElement("canvas");
-            var ctx = canvas.getContext("2d");
-            ctx.drawImage(img, 0, 0);
-            callback(!OpenSeadragon.isCanvasTainted(canvas));
-        };
-        img.src = corsImg;
-    }
-
     QUnit.test( 'CrossOriginPolicyMissing', function (assert) {
         var done = assert.async();
         viewer.crossOriginPolicy = false;
@@ -343,86 +329,68 @@
 
     QUnit.test( 'CrossOriginPolicyAnonymous', function (assert) {
         var done = assert.async();
-        browserSupportsImgCrossOrigin(function(supported) {
-            if (!supported) {
-                assert.expect(0);
-                done();
-            } else {
-                viewer.crossOriginPolicy = 'Anonymous';
-                viewer.open( {
-                    type: 'legacy-image-pyramid',
-                    levels: [ {
-                            url: corsImg,
-                            width: 135,
-                            height: 155
-                        } ]
-                } );
-                viewer.addOnceHandler('tile-drawn', function() {
-                    assert.ok(!OpenSeadragon.isCanvasTainted(viewer.drawer.context.canvas),
-                        "Canvas should not be tainted.");
-                    done();
-                });
-            }
+
+        viewer.crossOriginPolicy = 'Anonymous';
+        viewer.open( {
+            type: 'legacy-image-pyramid',
+            levels: [ {
+                    url: corsImg,
+                    width: 135,
+                    height: 155
+                } ]
+        } );
+        viewer.addOnceHandler('tile-drawn', function() {
+            assert.ok(!OpenSeadragon.isCanvasTainted(viewer.drawer.context.canvas),
+                "Canvas should not be tainted.");
+            done();
         });
 
     } );
 
     QUnit.test( 'CrossOriginPolicyOption', function (assert) {
         var done = assert.async();
-        browserSupportsImgCrossOrigin(function(supported) {
-            if (!supported) {
-                assert.expect(0);
-                done();
-            } else {
-                viewer.crossOriginPolicy = "Anonymous";
-                viewer.smoothTileEdgesMinZoom = Infinity;
-                viewer.addTiledImage( {
-                    tileSource: {
-                        type: 'legacy-image-pyramid',
-                        levels: [ {
-                            url: corsImg,
-                            width: 135,
-                            height: 155
-                        } ]
-                    },
-                    crossOriginPolicy : false
-                } );
-                viewer.addOnceHandler('tile-drawn', function() {
-                    assert.ok(OpenSeadragon.isCanvasTainted(viewer.drawer.context.canvas),
-                        "Canvas should be tainted.");
-                    done();
-                });
-            }
+
+        viewer.crossOriginPolicy = "Anonymous";
+        viewer.smoothTileEdgesMinZoom = Infinity;
+        viewer.addTiledImage( {
+            tileSource: {
+                type: 'legacy-image-pyramid',
+                levels: [ {
+                    url: corsImg,
+                    width: 135,
+                    height: 155
+                } ]
+            },
+            crossOriginPolicy : false
+        } );
+        viewer.addOnceHandler('tile-drawn', function() {
+            assert.ok(OpenSeadragon.isCanvasTainted(viewer.drawer.context.canvas),
+                "Canvas should be tainted.");
+            done();
         });
 
     } );
 
     QUnit.test( 'CrossOriginPolicyTileSource', function (assert) {
         var done = assert.async();
-        browserSupportsImgCrossOrigin(function(supported) {
-            if (!supported) {
-                assert.expect(0);
-                done();
-            } else {
-                viewer.crossOriginPolicy = false;
-                viewer.smoothTileEdgesMinZoom = Infinity;
-                viewer.addTiledImage( {
-                    tileSource: {
-                        type: 'legacy-image-pyramid',
-                        levels: [ {
-                            url: corsImg,
-                            width: 135,
-                            height: 155
-                        } ],
-                        crossOriginPolicy : "Anonymous"
-                    }
-                } );
-                viewer.addOnceHandler('tile-drawn', function() {
-                    assert.ok(!OpenSeadragon.isCanvasTainted(viewer.drawer.context.canvas),
-                        "Canvas should not be tainted.");
-                    done();
-                });
+
+        viewer.crossOriginPolicy = false;
+        viewer.smoothTileEdgesMinZoom = Infinity;
+        viewer.addTiledImage( {
+            tileSource: {
+                type: 'legacy-image-pyramid',
+                levels: [ {
+                    url: corsImg,
+                    width: 135,
+                    height: 155
+                } ],
+                crossOriginPolicy : "Anonymous"
             }
+        } );
+        viewer.addOnceHandler('tile-drawn', function() {
+            assert.ok(!OpenSeadragon.isCanvasTainted(viewer.drawer.context.canvas),
+                "Canvas should not be tainted.");
+            done();
         });
 
     } );
diff --git a/test/modules/tiledimage.js b/test/modules/tiledimage.js
index 0fce1dc7..46860648 100644
--- a/test/modules/tiledimage.js
+++ b/test/modules/tiledimage.js
@@ -530,13 +530,6 @@
         }]);
     });
 
-    // PhantomJS is missing Function.prototype.bind
-    function bind(func, _this) {
-        return function() {
-            return func.apply(_this, arguments);
-        };
-    }
-
     QUnit.test('_getCornerTiles without wrapping', function(assert) {
         var tiledImageMock = {
             wrapHorizontal: false,
@@ -549,9 +542,7 @@
                 tileOverlap: 1,
             }),
         };
-        var _getCornerTiles = bind(
-            OpenSeadragon.TiledImage.prototype._getCornerTiles,
-            tiledImageMock);
+        var _getCornerTiles = OpenSeadragon.TiledImage.prototype._getCornerTiles.bind(tiledImageMock);
 
         function assertCornerTiles(topLeftBound, bottomRightBound,
             expectedTopLeft, expectedBottomRight) {
@@ -599,9 +590,7 @@
                 tileOverlap: 1,
             }),
         };
-        var _getCornerTiles = bind(
-            OpenSeadragon.TiledImage.prototype._getCornerTiles,
-            tiledImageMock);
+        var _getCornerTiles = OpenSeadragon.TiledImage.prototype._getCornerTiles.bind(tiledImageMock);
 
         function assertCornerTiles(topLeftBound, bottomRightBound,
             expectedTopLeft, expectedBottomRight) {
@@ -648,9 +637,7 @@
                 tileOverlap: 1,
             }),
         };
-        var _getCornerTiles = bind(
-            OpenSeadragon.TiledImage.prototype._getCornerTiles,
-            tiledImageMock);
+        var _getCornerTiles = OpenSeadragon.TiledImage.prototype._getCornerTiles.bind(tiledImageMock);
 
         function assertCornerTiles(topLeftBound, bottomRightBound,
             expectedTopLeft, expectedBottomRight) {