Adding initial page feature

Hi there,

I work at Lumis [http://www.lumis.com.br] and here we'll start to use a fork of your code to our publications viewer app, whose nickname is Poligno. We found useful to set an initial scroll to an element, so I'm sending you this pull request to thank you for your code and collaborate too.

Best regards,
=P
All right, $$postDigest might solve the problem, it was just a hacky setTimeout Zero just to run scrollTop after content loaded, waiting all DOM negotiation finishes before scrollTop, or parent height would be 0px.
I'll note this as many others under the hood and not documented useful angular features found.