fix(ui-sref-active): Add CSS class immediately (avoid delay)

- a timeout is used to allow the CSS class to be added in an ng-repeat, where angular resets the class="" attr from the expression
- also add the class without a timeout, to avoid flicker

Closes #2503

src/ng1/directives/stateDirectives.ts

@@ -461,6 +461,7 @@ let uiSrefActive = ['$state', '$stateParams', '$interpolate', '$transitions', '$
           }
 
           function addClass(el: IAugmentedJQuery, className: string) {
+            el.addClass(className);
             $timeout(function () {
               el.addClass(className);
             });