Bump mocha version

Author: jamesls

package.json

@@ -12,7 +12,7 @@
   "devDependencies": {
     "grunt": "^0.4.4",
     "grunt-contrib-jshint": "^0.10.0",
-    "mocha": "^1.18.2",
+    "mocha": "^2.1.0",
     "grunt-contrib-uglify": "^0.4.0",
     "grunt-eslint": "^0.4.0"
   },