Upgrade to webpack v3

Author: ArayB

package.json

@@ -126,7 +126,7 @@
     "wdio-selenium-standalone-service": "^0.0.9",
     "wdio-spec-reporter": "^0.1.0",
     "webdriverio": "^4.8.0",
-    "webpack": "^2.3.3",
+    "webpack": "^3.0.0",
     "webpack-bundle-analyzer": "^2.2.1",
     "webpack-dev-middleware": "^1.10.0",
     "webpack-hot-middleware": "^2.18.0",