added ng-cloak to hide angularjs code before DOM is upgraded AGPUSH-738

https://issues.jboss.org/browse/AGPUSH-738
You are right, it is included in angular.css [1], but the thing is we want to include this as soon as possible so we avoud reflows caused by applying downloaded CSS sources.

[1] https://github.com/angular/angular.js/blob/master/css/angular.css