diff --git a/package-lock.json b/package-lock.json
index a0f1ace5..8a977699 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4,6 +4,26 @@
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-        "negotiator": "0.6.1"
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-      "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.7.3.tgz",
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+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-7.1.0.tgz",
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-          "integrity": "sha1-ReN/s56No/JbruP/U2niu18iAXo=",
-          "dev": true
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+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.1.0.tgz",
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@@ -49,36 +58,31 @@
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-        "micromatch": "2.3.11",
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+        "micromatch": "^2.1.5",
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-      "dev": true
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@@ -127,15 +135,15 @@
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@@ -187,7 +196,7 @@
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       "dev": true,
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-        "sprintf-js": "1.0.3"
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@@ -196,7 +205,7 @@
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       "dev": true,
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@@ -223,28 +232,27 @@
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+          "dev": true,
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+        "nan": "^2.12.1",
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@@ -1833,7 +1785,8 @@
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@@ -1898,7 +1856,7 @@
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@@ -1925,7 +1883,7 @@
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-            "strip-ansi": "3.0.1",
-            "wide-align": "1.1.3"
+            "aproba": "^1.0.3",
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+            "object-assign": "^4.1.0",
+            "signal-exit": "^3.0.0",
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-            "minimatch": "3.0.4",
-            "once": "1.4.0",
-            "path-is-absolute": "1.0.1"
+            "fs.realpath": "^1.0.0",
+            "inflight": "^1.0.4",
+            "inherits": "2",
+            "minimatch": "^3.0.4",
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@@ -1976,7 +1934,7 @@
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@@ -1985,7 +1943,7 @@
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-            "wrappy": "1.0.2"
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@@ -2013,8 +1972,9 @@
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@@ -2051,13 +2014,14 @@
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-            "sax": "1.2.4"
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@@ -2085,16 +2049,16 @@
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-            "rc": "1.2.8",
-            "rimraf": "2.6.3",
-            "semver": "5.7.0",
-            "tar": "4.4.8"
+            "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",
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@@ -2103,8 +2067,8 @@
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-            "osenv": "0.1.5"
+            "abbrev": "1",
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@@ -2119,8 +2083,8 @@
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-            "npm-bundled": "1.0.6"
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@@ -2129,16 +2093,17 @@
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-            "console-control-strings": "1.1.0",
-            "gauge": "2.7.4",
-            "set-blocking": "2.0.0"
+            "are-we-there-yet": "~1.1.2",
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-            "minimist": "1.2.0",
-            "strip-json-comments": "2.0.1"
+            "deep-extend": "^0.6.0",
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@@ -2214,13 +2180,13 @@
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@@ -2229,13 +2195,14 @@
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@@ -2283,15 +2251,16 @@
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           "bundled": true,
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-            "mkdirp": "0.5.1",
-            "safe-buffer": "5.1.2",
-            "yallist": "3.0.3"
+            "chownr": "^1.1.1",
+            "fs-minipass": "^1.2.5",
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@@ -2327,33 +2296,23 @@
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           "version": "1.0.2",
           "bundled": true,
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@@ -2365,15 +2324,16 @@
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-        "string-width": "1.0.2",
-        "strip-ansi": "3.0.1",
-        "wide-align": "1.1.3"
+        "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",
+        "strip-ansi": "^3.0.1",
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@@ -2381,8 +2341,9 @@
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           "integrity": "sha1-754xOG8DGn8NZDr4L95QxFfvAMs=",
           "dev": true,
+          "optional": true,
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@@ -2390,10 +2351,11 @@
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           "dev": true,
+          "optional": true,
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-            "code-point-at": "1.1.0",
-            "is-fullwidth-code-point": "1.0.0",
-            "strip-ansi": "3.0.1"
+            "code-point-at": "^1.0.0",
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@@ -2404,7 +2366,7 @@
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       "dev": true,
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@@ -2425,16 +2387,6 @@
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-        "inherits": "2.0.3",
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-        "once": "1.4.0",
-        "path-is-absolute": "1.0.1"
+        "fs.realpath": "^1.0.0",
+        "inflight": "^1.0.4",
+        "inherits": "2",
+        "minimatch": "^3.0.2",
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@@ -2462,8 +2414,8 @@
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       "dev": true,
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-        "glob-parent": "2.0.0",
-        "is-glob": "2.0.1"
+        "glob-parent": "^2.0.0",
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@@ -2472,7 +2424,7 @@
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-        "commander": "2.17.1",
-        "source-map": "0.6.1"
+        "commander": "~2.20.3",
+        "source-map": "~0.6.1"
       }
     },
     "uglify-to-browserify": {
@@ -6123,14 +6132,20 @@
       "dev": true,
       "optional": true
     },
+    "ultron": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/ultron/-/ultron-1.1.1.tgz",
+      "integrity": "sha512-UIEXBNeYmKptWH6z8ZnqTeS8fV74zG0/eRU9VGkpzz+LIJNs8W/zM/L+7ctCkRrgbNnnR0xxw4bKOr0cW0N0Og==",
+      "dev": true
+    },
     "underscore.string": {
       "version": "3.3.5",
       "resolved": "https://registry.npmjs.org/underscore.string/-/underscore.string-3.3.5.tgz",
       "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": {
@@ -6139,10 +6154,10 @@
       "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"
+        "arr-union": "^3.1.0",
+        "get-value": "^2.0.6",
+        "is-extendable": "^0.1.1",
+        "set-value": "^2.0.1"
       }
     },
     "unpipe": {
@@ -6157,8 +6172,8 @@
       "integrity": "sha1-g3aHP30jNRef+x5vw6jtDfyKtVk=",
       "dev": true,
       "requires": {
-        "has-value": "0.3.1",
-        "isobject": "3.0.1"
+        "has-value": "^0.3.1",
+        "isobject": "^3.0.0"
       },
       "dependencies": {
         "has-value": {
@@ -6167,9 +6182,9 @@
           "integrity": "sha1-ex9YutpiyoJ+wKIHgCVlSEWZXh8=",
           "dev": true,
           "requires": {
-            "get-value": "2.0.6",
-            "has-values": "0.1.4",
-            "isobject": "2.1.0"
+            "get-value": "^2.0.3",
+            "has-values": "^0.1.4",
+            "isobject": "^2.0.0"
           },
           "dependencies": {
             "isobject": {
@@ -6202,9 +6217,16 @@
       "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.2.2.tgz",
       "integrity": "sha512-KY9Frmirql91X2Qgjry0Wd4Y+YTdrdZheS8TFwvkbLWf/G5KNJDCh6pKL5OZctEW4+0Baa5idK2ZQuELRwPznQ==",
       "dev": true,
-      "optional": true,
       "requires": {
-        "punycode": "2.1.1"
+        "punycode": "^2.1.0"
+      },
+      "dependencies": {
+        "punycode": {
+          "version": "2.1.1",
+          "resolved": "https://registry.npmjs.org/punycode/-/punycode-2.1.1.tgz",
+          "integrity": "sha512-XRsRjdf+j5ml+y/6GKHPZbrF/8p2Yga0JPtdqTIY2Xe5ohJPD9saDJJLPvp9+NSBprVvevdXZybnj2cv8OEd0A==",
+          "dev": true
+        }
       }
     },
     "uri-path": {
@@ -6219,12 +6241,39 @@
       "integrity": "sha1-2pN/emLiH+wf0Y1Js1wpNQZ6bHI=",
       "dev": true
     },
+    "url": {
+      "version": "0.11.0",
+      "resolved": "https://registry.npmjs.org/url/-/url-0.11.0.tgz",
+      "integrity": "sha1-ODjpfPxgUh63PFJajlW/3Z4uKPE=",
+      "dev": true,
+      "requires": {
+        "punycode": "1.3.2",
+        "querystring": "0.2.0"
+      }
+    },
     "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": {
+      "version": "0.10.3",
+      "resolved": "https://registry.npmjs.org/util/-/util-0.10.3.tgz",
+      "integrity": "sha1-evsa/lCAUkZInj23/g7TeTNqwPk=",
+      "dev": true,
+      "requires": {
+        "inherits": "2.0.1"
+      },
+      "dependencies": {
+        "inherits": {
+          "version": "2.0.1",
+          "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.1.tgz",
+          "integrity": "sha1-sX0I0ya0Qj5Wjv9xn5GwscvfafE=",
+          "dev": true
+        }
+      }
+    },
     "util-deprecate": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
@@ -6237,12 +6286,11 @@
       "integrity": "sha1-n5VxD1CiZ5R7LMwSR0HBAoQn5xM=",
       "dev": true
     },
-    "uuid": {
-      "version": "3.3.3",
-      "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.3.3.tgz",
-      "integrity": "sha512-pW0No1RGHgzlpHJO1nsVrHKpOEIxkGg1xB+v0ZmdNH5OAeAwzAVrCnI2/6Mtx+Uys6iaylxa+D3g4j63IKKjSQ==",
-      "dev": true,
-      "optional": true
+    "v8-compile-cache": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/v8-compile-cache/-/v8-compile-cache-2.1.0.tgz",
+      "integrity": "sha512-usZBT3PW+LOjM25wbqIlZwPeJV+3OSz3M1k1Ws8snlW39dZyYL9lOGC5FgPVHfk0jKmjiDV8Z0mIbVQPiwFs7g==",
+      "dev": true
     },
     "validate-npm-package-license": {
       "version": "3.0.4",
@@ -6250,20 +6298,8 @@
       "integrity": "sha512-DpKm2Ui/xN7/HQKCtpZxoRWBhZ9Z0kqtygG8XCgNQ8ZlDnxuQmWhj566j8fN4Cu3/JmbhsDo7fcAJq4s9h27Ew==",
       "dev": true,
       "requires": {
-        "spdx-correct": "3.1.0",
-        "spdx-expression-parse": "3.0.0"
-      }
-    },
-    "verror": {
-      "version": "1.10.0",
-      "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",
-        "core-util-is": "1.0.2",
-        "extsprintf": "1.3.0"
+        "spdx-correct": "^3.0.0",
+        "spdx-expression-parse": "^3.0.0"
       }
     },
     "walk-sync": {
@@ -6272,8 +6308,8 @@
       "integrity": "sha1-VYoWrqyMDbWcAotzxm85doTs5GU=",
       "dev": true,
       "requires": {
-        "ensure-posix-path": "1.1.1",
-        "matcher-collection": "1.1.2"
+        "ensure-posix-path": "^1.0.0",
+        "matcher-collection": "^1.0.0"
       }
     },
     "walkdir": {
@@ -6288,8 +6324,8 @@
       "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": {
@@ -6298,13 +6334,100 @@
       "integrity": "sha512-nqHUnMXmBzT0w570r2JpJxfiSD1IzoI+HGVdd3aZ0yNi3ngvQ4jv1dtHt5VGxfI2yj5yqImPhOK4vmIh2xMbGg==",
       "dev": true
     },
+    "websocket-stream": {
+      "version": "5.5.0",
+      "resolved": "https://registry.npmjs.org/websocket-stream/-/websocket-stream-5.5.0.tgz",
+      "integrity": "sha512-EXy/zXb9kNHI07TIMz1oIUIrPZxQRA8aeJ5XYg5ihV8K4kD1DuA+FY6R96HfdIHzlSzS8HiISAfrm+vVQkZBug==",
+      "dev": true,
+      "requires": {
+        "duplexify": "^3.5.1",
+        "inherits": "^2.0.1",
+        "readable-stream": "^2.3.3",
+        "safe-buffer": "^5.1.2",
+        "ws": "^3.2.0",
+        "xtend": "^4.0.0"
+      },
+      "dependencies": {
+        "process-nextick-args": {
+          "version": "2.0.1",
+          "resolved": "https://registry.npmjs.org/process-nextick-args/-/process-nextick-args-2.0.1.tgz",
+          "integrity": "sha512-3ouUOpQhtgrbOa17J7+uxOTpITYWaGP7/AhoR3+A+/1e9skrzelGi/dXzEYyvbxubEF6Wn2ypscTKiKJFFn1ag==",
+          "dev": 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,
+          "requires": {
+            "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"
+          },
+          "dependencies": {
+            "safe-buffer": {
+              "version": "5.1.2",
+              "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
+              "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g==",
+              "dev": true
+            }
+          }
+        },
+        "safe-buffer": {
+          "version": "5.2.0",
+          "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.0.tgz",
+          "integrity": "sha512-fZEwUGbVl7kouZs1jCdMLdt95hdIv0ZeHg6L7qPeciMZhZ+/gdesW4wgTARkrFWEpspjEATAzUGPG8N2jJiwbg==",
+          "dev": true
+        },
+        "string_decoder": {
+          "version": "1.1.1",
+          "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
+          "integrity": "sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg==",
+          "dev": true,
+          "requires": {
+            "safe-buffer": "~5.1.0"
+          },
+          "dependencies": {
+            "safe-buffer": {
+              "version": "5.1.2",
+              "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
+              "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g==",
+              "dev": true
+            }
+          }
+        },
+        "ws": {
+          "version": "3.3.3",
+          "resolved": "https://registry.npmjs.org/ws/-/ws-3.3.3.tgz",
+          "integrity": "sha512-nnWLa/NwZSt4KQJu51MYlCcSQ5g7INpOrOMt4XV8j4dqTXdmlUmSHQ8/oLC069ckre0fRsgfvsKwbTdtKLCDkA==",
+          "dev": true,
+          "requires": {
+            "async-limiter": "~1.0.0",
+            "safe-buffer": "~5.1.0",
+            "ultron": "~1.1.0"
+          },
+          "dependencies": {
+            "safe-buffer": {
+              "version": "5.1.2",
+              "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
+              "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g==",
+              "dev": true
+            }
+          }
+        }
+      }
+    },
     "which": {
       "version": "1.2.14",
       "resolved": "https://registry.npmjs.org/which/-/which-1.2.14.tgz",
       "integrity": "sha1-mofEN48D6CfOyvGs31bHNsAcFOU=",
       "dev": true,
       "requires": {
-        "isexe": "2.0.0"
+        "isexe": "^2.0.0"
       }
     },
     "which-pm-runs": {
@@ -6319,8 +6442,9 @@
       "resolved": "https://registry.npmjs.org/wide-align/-/wide-align-1.1.3.tgz",
       "integrity": "sha512-QGkOQc8XL6Bt5PwnsExKBPuMKBxnGxWWW3fU55Xt4feHozMUhdUMaBCk290qpm/wG5u/RSKzwdAC4i51YigihA==",
       "dev": true,
+      "optional": true,
       "requires": {
-        "string-width": "2.1.1"
+        "string-width": "^1.0.2 || 2"
       }
     },
     "window-size": {
@@ -6330,6 +6454,12 @@
       "dev": true,
       "optional": true
     },
+    "word-wrap": {
+      "version": "1.2.3",
+      "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.3.tgz",
+      "integrity": "sha512-Hz/mrNwitNRh/HUAtM/VT/5VH+ygD6DV7mYKZAtHOrbs8U7lvPS6xf7EJKMF0uW1KJCl0H701g3ZGus+muE5vQ==",
+      "dev": true
+    },
     "wordwrap": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-1.0.0.tgz",
@@ -6343,12 +6473,12 @@
       "dev": true
     },
     "write": {
-      "version": "0.2.1",
-      "resolved": "https://registry.npmjs.org/write/-/write-0.2.1.tgz",
-      "integrity": "sha1-X8A4KOJkzqP+kUVUdvejxWbLB1c=",
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/write/-/write-1.0.3.tgz",
+      "integrity": "sha512-/lg70HAjtkUgWPVZhZcm+T4hkL8Zbtp1nFNOn3lRrxnlv50SRBv7cR7RqR+GMsd3hUXy9hWBo4CHTbFTcOYwig==",
       "dev": true,
       "requires": {
-        "mkdirp": "0.5.1"
+        "mkdirp": "^0.5.1"
       }
     },
     "ws": {
@@ -6357,7 +6487,7 @@
       "integrity": "sha512-GIyAXC2cB7LjvpgMt9EKS2ldqr0MTrORaleiOno6TweZ6r3TKtoFQWay/2PceJ3RuBasOHzXNn5Lrw1X0bEjqA==",
       "dev": true,
       "requires": {
-        "async-limiter": "1.0.0"
+        "async-limiter": "~1.0.0"
       }
     },
     "xtend": {
@@ -6366,12 +6496,6 @@
       "integrity": "sha1-pcbVMr5lbiPbgg77lDofBJmNY68=",
       "dev": true
     },
-    "yallist": {
-      "version": "2.1.2",
-      "resolved": "https://registry.npmjs.org/yallist/-/yallist-2.1.2.tgz",
-      "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI=",
-      "dev": true
-    },
     "yargs": {
       "version": "3.10.0",
       "resolved": "https://registry.npmjs.org/yargs/-/yargs-3.10.0.tgz",
@@ -6379,9 +6503,9 @@
       "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": {
@@ -6400,7 +6524,7 @@
       "integrity": "sha1-lSj0QtqxsihOWLQ3m7GU4i4MQAU=",
       "dev": true,
       "requires": {
-        "fd-slicer": "1.0.1"
+        "fd-slicer": "~1.0.1"
       }
     },
     "zip-stream": {
@@ -6409,10 +6533,10 @@
       "integrity": "sha1-qLxF9MG0lpnGuQGYuqyqzbzUugQ=",
       "dev": true,
       "requires": {
-        "archiver-utils": "1.3.0",
-        "compress-commons": "1.2.2",
-        "lodash": "4.17.10",
-        "readable-stream": "2.2.2"
+        "archiver-utils": "^1.3.0",
+        "compress-commons": "^1.2.0",
+        "lodash": "^4.8.0",
+        "readable-stream": "^2.0.0"
       }
     }
   }
diff --git a/package.json b/package.json
index bd2dd38a..90150d97 100644
--- a/package.json
+++ b/package.json
@@ -29,14 +29,14 @@
   },
   "devDependencies": {
     "grunt": "^1.0.4",
-    "grunt-contrib-clean": "^1.1.0",
-    "grunt-contrib-compress": "^1.5.0",
+    "grunt-contrib-clean": "^2.0.0",
+    "grunt-contrib-compress": "^1.6.0",
     "grunt-contrib-concat": "^1.0.1",
-    "grunt-contrib-connect": "^1.0.2",
+    "grunt-contrib-connect": "^2.1.0",
     "grunt-contrib-qunit": "^3.1.0",
-    "grunt-contrib-uglify": "^3.4.0",
+    "grunt-contrib-uglify": "^4.0.1",
     "grunt-contrib-watch": "^1.1.0",
-    "grunt-eslint": "^20.2.0",
+    "grunt-eslint": "^22.0.0",
     "grunt-git-describe": "^2.4.4",
     "grunt-istanbul": "^0.8.0",
     "grunt-text-replace": "^0.4.0",
diff --git a/src/mousetracker.js b/src/mousetracker.js
index e36ca05b..050e6cc3 100644
--- a/src/mousetracker.js
+++ b/src/mousetracker.js
@@ -2499,7 +2499,7 @@
 
         // If isPrimary is not known for the pointer then set it according to our rules:
         //    true if the first pointer in the gesture, otherwise false
-        if ( !gPoint.hasOwnProperty( 'isPrimary' ) ) {
+        if ( !Object.prototype.hasOwnProperty.call( gPoint, 'isPrimary' ) ) {
             if ( pointsList.getLength() === 0 ) {
                 gPoint.isPrimary = true;
             } else {
@@ -2535,7 +2535,7 @@
             listLength = pointsList.removeById( gPoint.id );
 
             // If isPrimary is not known for the pointer and we just removed the primary pointer from the list then we need to set another pointer as primary
-            if ( !gPoint.hasOwnProperty( 'isPrimary' ) ) {
+            if ( !Object.prototype.hasOwnProperty.call( gPoint, 'isPrimary' ) ) {
                 primaryPoint = pointsList.getPrimary();
                 if ( !primaryPoint ) {
                     primaryPoint = pointsList.getByIndex( 0 );
@@ -3172,7 +3172,7 @@
 
             if ( updateGPoint ) {
                 // Already tracking the pointer...update it
-                if ( curGPoint.hasOwnProperty( 'isPrimary' ) ) {
+                if ( Object.prototype.hasOwnProperty.call( curGPoint, 'isPrimary' ) ) {
                     updateGPoint.isPrimary = curGPoint.isPrimary;
                 }
                 updateGPoint.lastPos = updateGPoint.currentPos;
diff --git a/src/openseadragon.js b/src/openseadragon.js
index d5b68441..ac15ac9f 100644
--- a/src/openseadragon.js
+++ b/src/openseadragon.js
@@ -735,7 +735,7 @@
   *
   */
 
-
+/* eslint-disable no-redeclare */
 function OpenSeadragon( options ){
     return new OpenSeadragon.Viewer( options );
 }
@@ -2256,7 +2256,7 @@ function OpenSeadragon( options ){
 
                 if (headers) {
                     for (var headerName in headers) {
-                        if (headers.hasOwnProperty(headerName) && headers[headerName]) {
+                        if (Object.prototype.hasOwnProperty.call(headers, headerName) && headers[headerName]) {
                             request.setRequestHeader(headerName, headers[headerName]);
                         }
                     }
@@ -2291,7 +2291,7 @@ function OpenSeadragon( options ){
                 request.onreadystatechange = function(){};
 
                 if (window.XDomainRequest) { // IE9 or IE8 might as well try to use XDomainRequest
-                    var xdr = new XDomainRequest();
+                    var xdr = new window.XDomainRequest();
                     if (xdr) {
                         xdr.onload = function (e) {
                             if ( $.isFunction( onSuccess ) ) {
diff --git a/src/tiledimage.js b/src/tiledimage.js
index abe8c2da..54cc84fe 100644
--- a/src/tiledimage.js
+++ b/src/tiledimage.js
@@ -1714,10 +1714,10 @@ function providesCoverage( coverage, level, x, y ) {
     if ( x === undefined || y === undefined ) {
         rows = coverage[ level ];
         for ( i in rows ) {
-            if ( rows.hasOwnProperty( i ) ) {
+            if ( Object.prototype.hasOwnProperty.call( rows, i ) ) {
                 cols = rows[ i ];
                 for ( j in cols ) {
-                    if ( cols.hasOwnProperty( j ) && !cols[ j ] ) {
+                    if ( Object.prototype.hasOwnProperty.call( cols, j ) && !cols[ j ] ) {
                         return false;
                     }
                 }