JMPDComm: Fix replacing artist with album artist in the album object.

This is a regression of 51cecb7 where an attempt to set a new artist
object in an album object was attempted directly during iteration
rather than by method parameter. This also corrects the album artist
identifier, and renames the method to more accurately reflect it's
purpose.
Merge branch 'develop' of https://github.com/abarisain/dmix into develop
Collapsed Albums: add setting
Collapsed Albums: add strings

Conflicts:
	MPDroid/src/main/res/values-de/strings.xml
Collapsed Albums: add PlaylistAlbum
Collapsed Albums: add size() and hasText() to AbstractPlaylistMusic
Collapsed Albums: add CollapsedPlaylistFragment
Collapsed Albums: use CollapsedPlaylistFragment
make playlist text autoscroll
make header in SongsFragment autoscroll
make Songs in SongsFragment autoscroll
autoscroll in albumfragment -- partially
show disc and track number in NowPlaying