Upgrade webpack dependency

Author: SpaceK33z

package.json

@@ -23,7 +23,7 @@
     "should": "^11.1.0",
     "sinon": "^1.17.5",
     "supertest": "^2.0.0",
-    "webpack": "^2.1.0-beta.22"
+    "webpack": "^2.2.0"
   },
   "license": "MIT",
   "engines": {