Merge pull request #22 from adrielparedes/master

Problema con nullpointer en la configuracion
Issue #5: Se agrega una playlist con su implementacion
Merge branch 'master' of https://github.com/SideEffectIdeas/openmusic-node
Added license file and headers. Now we are under Apache 2.0
moved LICENSE.md from source folder
Merge pull request #23 from ClaraAllende/master

Issue #9 - License
Issue #5: Playlist service added
Merge branch 'master' of https://github.com/SideEffectIdeas/openmusic-node
Issue #5: se agrego una primera version de playlists
Se cambiaron los mimes de la app