introduce after-animation-callback into ng-include-directive

This pull-request introduces a new callback to the ng-include-directive.

The existing callback in this directive triggers the $autoScroll-function which scrolls to a specific anchor in the document. In my use-case I had to scroll a specific amout of pixels, after animation completes. I could only achive that by introducing the new callback "afterAnimation", which is executed right after the $autoScroll inside the directive.

Maybe this is useful to other developers, hence I packed this into a pull-request :-)

Thank you :-)