Turn off production option of webpack

With production option, Uglify of webpack fails.
angular/angular-cli#5730

There are two ways to solve this issue. Turning off
production option of webpack or making babel do more
polyfill by passing browser options even though
the result code will never run on browser.

Author: joybro

package.json

@@ -6,7 +6,7 @@
   "scripts": {
     "test": "mocha-webpack --webpack-config webpack.test.config.js test",
     "start:standalone": "npm run build:standalone && node ./standalone/standalone.bundle.js",
-    "build": "webpack -p --config webpack.server.config.js",
+    "build": "webpack --config webpack.server.config.js",
     "build:standalone": "webpack --config webpack.standalone.config.js",
     "dist": "cp package.json ./dist/ && cd ./dist && npm install --production",
     "lint": "eslint . --cache",