stop minifying as it doesn't improve performance significantly

app/package.json

@@ -21,7 +21,6 @@
     "babel-loader": "6.2.4",
     "babel-plugin-transform-es2015-modules-commonjs": "6.10.3",
     "babel-plugin-transform-react-jsx": "6.8.0",
-    "babel-preset-es2015": "^6.9.0",
     "css-loader": "0.23.1",
     "eslint": "2.13.1",
     "eslint-config-standard": "5.3.1",
@@ -61,10 +60,8 @@
     }
   },
   "babel": {
-    "presets": [
-      "es2015"
-    ],
     "plugins": [
+      "transform-es2015-modules-commonjs",
       "transform-react-jsx"
     ]
   },

app/webpack.config.js

@@ -33,7 +33,6 @@ module.exports = {
   plugins: [
     new webpack.optimize.OccurrenceOrderPlugin(),
     new webpack.ExternalsPlugin('commonjs', ['electron']),
-    new webpack.optimize.UglifyJsPlugin({ compress: { warnings: false } }),
     new webpack.DefinePlugin({
       'process.env': {
         'NODE_ENV': JSON.stringify(process.env.NODE_ENV)