<Android>Nearly completed Playlist Activity

Fixed Bugs:
-Display Adapter not being refreshed
-Intents are now paired by startActivityForResult() & this.finish()

Current Bugs:
- Need to fix deleting playlists (Long pressing playlist name)

Features not yet implemented:
- Need to check if song selection actually works
- Long pressing playlists to play all songs
- Long pressing songs to delete songs

Integration:
- SongActivity.java: at line 66, onItemClick - add the intent to load
the song into the song player.
- Need to integrate the Playlist manager as a sub-activity of the Main
Activity; make sure PlaylistActivity.java is the one being intented as
it controls everything related to Playlists