js-beautify: add as dev dependency

Author: macbre

package.json

@@ -35,6 +35,7 @@
     "autoprefixer-core": "~3.1.2",
     "glob": "~4.0.5",
     "istanbul": "~0.3.0",
+    "js-beautify": "~1.5.4",
     "jshint": "~2.5.2",
     "mocha": "~2.0.1"
   },