fix(webpack): add UglifyPlugin

for minification in production

Fixes #581

Author: benoror

other/webpack.config.es6.js

@@ -96,7 +96,8 @@ function getProdConfig() {
     plugins: _.union(getCommonPlugins(), [
       new webpack.optimize.DedupePlugin(),
       new webpack.optimize.OccurenceOrderPlugin(),
-      new webpack.optimize.AggressiveMergingPlugin()
+      new webpack.optimize.AggressiveMergingPlugin(),
+      new webpack.optimize.UglifyJsPlugin()
     ])
   };
 }

package.json

@@ -96,7 +96,6 @@
     "semantic-release": "4.3.5",
     "sinon": "1.17.2",
     "sinon-chai": "2.8.0",
-    "uglify-loader": "1.2.0",
     "validate-commit-msg": "1.0.0",
     "webpack": "1.12.2",
     "webpack-notifier": "1.2.1"