Update UI build system

* Faster build times
* Smaller bundle sizes
* Adjust paths
* Cleanup npm dependencies
* Remove unneded Grunt tasks

awx/ui/build/webpack.development.js

@@ -0,0 +1,11 @@
+const path = require('path');
+
+const _ = require('lodash');
+
+let base = require('./webpack.base');
+
+let development = {
+    devtool: 'cheap-source-map'
+};
+
+module.exports = _.merge(base, development);