Tooling: Use latest stable webpack

Webpack 1.14.0 is an old version, switch to using latest stable which
has better documentation, tree shaking, ES2015 modules and a core team
of contributors with funding. See https://webpack.js.org/

Additional changes:
* Recompile the frontend assets

Change-Id: I2c5940276e99dee104d04c6a0b83d8ab36a99df5

package.json

@@ -26,6 +26,6 @@
     "redux-thunk": "2.2.0",
     "stylelint-config-wikimedia": "0.3.0",
     "tap-dot": "^1.0.5",
-    "webpack": "^1.14.0"
+    "webpack": "^2.2.1"
   }
 }

webpack.config.js

@@ -21,5 +21,11 @@ module.exports = {
 			redux: path.resolve(__dirname, 'node_modules/redux/dist/redux.js'),
 			'redux-thunk': path.resolve(__dirname, 'node_modules/redux-thunk/dist/redux-thunk.js')
 		}
-	}
+	},
+	plugins: [
+		// To generate identifiers that are preserved over builds, webpack supplies
+		// the NamedModulesPlugin (generates comments with file names on bundle)
+		// https://webpack.js.org/guides/caching/#deterministic-hashes
+		new webpack.NamedModulesPlugin()
+	]
 };