make project compatible with direct npm/yarn installation from github repo

Gruntfile.js

@@ -194,8 +194,12 @@ module.exports = function(grunt) {
             target: sources
         },
         "git-describe": {
+            "options": {
+                failOnError: false
+            },
             build: {}
-        }
+        },
+        gitInfo: "unknown"
     });
 
     // ----------

package.json

@@ -30,6 +30,6 @@
   },
   "scripts": {
     "test": "grunt test",
-    "prepublish": "grunt build"
+    "prepare": "grunt build"
   }
 }