Delay $anchorScroll() to handle `autoscroll` for nested ng-includes. 

This resolves an issue where the contents of an `ng-include` also contain an ng-include with autoscroll, like this `<div ng-repeat=".." ng-include=".." autoscroll="">`. 

In issue #2637 the element to scroll to by using `#some-anchor-name` in the url, e.g. `<a name="some-anchor-name"></a>`, is not present in the dom by the time `$anchorScroll()` is called from the ngIncludeDirective.