add jquery-sortable dependency
moved GlobalThread class to GlobalPlayer/thread
refactored vlc player interaction into GlobalPlayer.player module
added more doc strings
added functionality for manipulation of the whole playlist
added individual track manipulation (playlist)
some version of sortable playlist
bugfixing: syntax errors
bugfixing: get_status argument type changed, duh >.<
open now prepends the playlist

instead of overwriting the first element
Merge branch 'playlist-backend' into develop
add append button
Merge branch 'develop' into playlist-frontend
fix some markup and all controls
fixed behaviour when removing last or first element

also: new 'open' behaviour: start new playlist
Merge branch 'playlist-backend' into develop
Merge branch 'develop' into playlist-frontend
working append
working remove and drag drop
less buggy drag and drop