-Temporarily fixed a bug that causes NullPointerExceptions when trying to animate the last row in the Grid View (outside of the currently instantiated subset of child views.)
-Added Transparent appbar to some fragments to make the design more immersive.
-The Navigation and System bars are now tinted according to the current Podcast.
-Cleaned up and added some more animation code to ListFragment.
-List rows now have colored icons based on their status and availability.
-BaseFragment is no longer an abstract class.
-CollectionFragment is the superclass of Grid/List-fragment that present podcast collection data.