Reintroduce pull request #319

don't show album artist if it is contained in artist tag

Conflicts:
	MPDroid/src/com/namelessdev/mpdroid/fragments/NowPlayingSmallFragment.java
don't show album artist if it is contained in artist tag

Conflicts:
	MPDroid/src/com/namelessdev/mpdroid/fragments/NowPlayingSmallFragment.java