Fixes namespace collision & allows command-line options to be passed to UI build system (#3876)

* Fixes BrowserSync window.name namespace collision #3872

* Allow command-line arguments to be passed to development UI builds.
Add support for --ng-debug and --router-debug flags to turn on Angular's
$log service and ui-router's trace utility.
Cleans up development debug settings & defunct websocket configuration.

Resolves lingering issues raised by trying read asynchronously-loaded config file during AngularJS config phase. #3872

* shrinkwrap updated minimist

* update CONTRIBUTING.md to include UI build options

* feedback/review

awx/ui/grunt-tasks/browserSync.js

@@ -17,7 +17,13 @@ module.exports = {
                 ws: true
             },
             keepalive: false,
-            watchTask: true
+            watchTask: true,
+            // The browser-sync-client lib will write your current scroll position to window.name
+            // https://github.com/BrowserSync/browser-sync-client/blob/a2718faa91e11553feca7a3962313bf1ec6ba3e5/dist/index.js#L500
+            // This strategy is enabled in the core browser-sync lib, and not externally documented as an option. Yay!
+            // https://github.com/BrowserSync/browser-sync/blob/a522aaf12b6167d5591ed285eb3086f43a4d9ac2/lib/default-config.js#L312
+            scrollRestoreTechnique: null,
+            injectChanges: true
         }
     }
 };