Added AnimationEnd event

This event will trigger when the animation on the ui-view is done animating.

Fixed an issue when currentScope was undefined

src/viewDirective.js

@@ -210,6 +210,10 @@ function $ViewDirective(   $state,   $injector,   $uiViewScroll) {
 
           var clone = $transclude(newScope, function(clone) {
             renderer.enter(clone, $element, function onUiViewEnter() {
+              if(currentScope) {
+                currentScope.$emit('$viewContentAnimationEnded');
+              }
+
               if (angular.isDefined(autoScrollExp) && !autoScrollExp || scope.$eval(autoScrollExp)) {
                 $uiViewScroll(clone);
               }