-Added a new class called TintableImageButton that removes the need for manually colored drawables. Coloring is done at runtime instead.
-Fixed Navigation Drawer layout to follor the Material Design specification.
-Added string resources for the navigation drawer items.
-Fixed a bug that would cause the playback service to crash on completion when reaching the end of an episode.
-Optimised playlist removal to be more efficient.
-Fixed a bug that caused the app to crash when using the navigation drawer to go from EpisodeFragment to GridFragment.