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/Gruntfile.js

@@ -30,6 +30,7 @@ module.exports = function(grunt) {
         'clean:tmp',
         'clean:static',
         'concurrent:dev',
+        'sync',
     ]);
 
     grunt.registerTask('devNoSync', [