Added favorite action bar item
Issue #2: added favorites to the list of categories
Issue #2: added functionality to click on the favorites "category"
Issue #2: Add category title to the favorites list
Issue 2: workaround for bug 29472 with action icons being invisible with viewpager
Issue #2: Simplify: put the favorites category at the end
Issue #2: separate cursor adapters for favorite and normal lists
Issue #2: show heart icon in normal poem list, for fav poems
Issue #2: Added empty list view for favorites list
Added proguard mapping 1.1.0