MediaLibrary for Android

Complete implementation of MediaLibrary for Android.

There are two limitations: The Android song table does not provide genre and album art information. I opted to avoid querying additional tables due to performance reasons. As a result if this:
- `Genre` is always unknown
- `HasArt` is always true
- `GetAlbumArt` and `GetThumbnail` will throw an exception if there is no album art available, or return with a Bitmap if it's available