Refactored code to support IMangaItem interface with visitor, similar to INavItem. Provides more control to the module over how the manga gets displayed
FavoritesAdapter.java now draws views according to added IMangaItem implementation
Added support for adding favorites. Fixed support bug in pre-ICS
Added Favorites item to nav drawer with appropriate view.  Refactored several classes to support this addition, since Favorites behave slightly different from simple items.
Merge pull request #19 from Ecchilon/17-pref-favorites

Added favorites