-Brought back CircularSeekBar class from the dead.
-Added a more immersive and material player design. The layout is probably final. Still needs some more functionality.
-Changed Navigation drawer entry from "Player" to "Now Playing"
-Fixed a bug that caused the Navigation Drawer to indicate that the wrong fragment was active.
-Added a Grid layout animation that plays when not coming back from a ListFragment.
-Tweaked the animation and coloring of the appbar.
-Service now immediately loads the last played track instead of it having to be called manually.
-Users can no longer navigate to Player fragment unless there's a track loaded.