use local mocha in ./node_modules/.bin instead of global mocha

Author: ZauberNerd

package.json

@@ -31,6 +31,6 @@
     "mocha": "~1.17.1"
   },
   "scripts": {
-    "test": "mocha -R spec"
+    "test": "./node_modules/.bin/mocha -R spec"
   }
 }