Implemented ActionBars + refactoring

Implemented Action Bar on all activities, added appropriate actions, and
wired all all click events - navigation is nearly complete

Added dependency on the QuickAction dialog:
https://github.com/lorensiuswlt/NewQuickAction

Added appropriate quick actions to Favourite Locations list and Sources
list

Implemented initial 'Manage Sources' activity (not yet implemented
required SQL code)

Refactored class names / XML file names to better group related files