added angular drag-and-drop library
added playlist listing in the sidebar
added draggable area to library
added playlist editor
playlist integration for queue
removed unnecessary checks from playlist jsonapi
added rest api to get the song metadata of all songs in a playlist
fix broken build
Merge pull request #53 from songster-project/feature/playlists

Feature/playlists
qr-image in package.json
basically showing an image as the qr-code ... not complete but good enough to start it in the front-end
changed content to svg
adepted to right mime-type
qr code can be seen
staging current development
disable karma crap and enable grunt watch
short-link generation is working
staging
created schema for long/short urls
added that when requested, we store the long/short url