add ".." (parent directory) to file browser
Simplify cover API : Remove the cacheOnly parameter.
Make the API simpler and was always set to false.
Refactor the PlaylistFragment to use the Music model objects  instead of strings
Merge pull request #317 from hurzl/newup

add ".." (parent directory) to file browser
name the apk MPDroid instead of MainAcitvity
show album artist on NowPlaying and according cover
don't show artist if empty, don't show both if albumarist==artist
Refactor cover download API : use AlbumInfo everywhere
make showing album artist an option
Improve Playlist for streams
make albumartist cover show up on playlist
Use the android TextUtils method instead of the custom StringsUtils.isNullOrEmpty()
Add progressbars to albums and album grid fragments
Display progress bar in the nowplayingsmall fragment when changing a cover
show albumartist cover in NowPlayingSmallFragment, too
Add progress bar to the album view when changing cover
Use artist instead of albumartist when albumartist is missing
Update the nowplaying cover on resume when you change the cover in the library activity.
Minor update : change the album key
Merge pull request #318 from hurzl/newup2

name the apk MPDroid and show album artist on NowPlaying
Cleaning up