Removed actionbarsherlock hack. Replaced with appcompat

Removed the actionbarsherlock code and replaced it with appcompat. This doesn't include any of the material design styles Google just put in the support library but does get rid of the dependency from a long deprecated library.
Very subtle but your commit has doesn't have a newline at the end. Hmm maybe it's a new Android Studio thing though? In that case probably safe to leave it as-is.