Added new sections to help. Made Login and Signup activities scrollable so that they remain usable on small screens. Added an access to HelpActivity through the LoginActivity's menu
update help content, rename Group Streamer occurences by GroupStreamer
add new grouprecommendation features
Background color for buttons in the player fragment. It looks better on smaller phones
change icon for group history
Merge branch 'NFC'
Fixed hard coded group ID in fragment
Merge branch 'NFC' of https://github.com/lca4/unison-android into NFC
Removes deprecated abstract requestTrack() from AbstractPlayer
Merge branch 'master' of https://github.com/lca4/unison-android
fix a bug when a user does not have any tag
FIX Always looping player in GroupsPlayer, removes *.orig files

Restores the previous behaviour of adding tracks to the TrackQueue
Merge branch 'master' of https://github.com/lca4/unison-android
Home button now works properly in GroupsActivity and SoloMainActiviy: it takes the user back to the home screen
Renames Solo mode to "Playlists" in menu
Merge branch 'master' of https://github.com/lca4/unison-android
start improving home layout
Merge branch 'master' of https://github.com/lca4/unison-android
Merge branch 'master' of https://github.com/lca4/unison-android
New troubleshooting category for player not working