Update UI build system

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

awx/ui/build/webpack.test.js

@@ -0,0 +1,21 @@
+const path = require('path');
+
+const _ = require('lodash');
+const webpack = require('webpack');
+
+const STATIC_URL = '/static/';
+
+let development = require('./webpack.development');
+
+let test = {
+    plugins: [
+        new webpack.DefinePlugin({
+            $basePath: STATIC_URL
+        })
+    ]
+};
+
+test.plugins = development.plugins.concat(test.plugins)
+
+module.exports = _.merge(development, test);
+