Merge pull request #278 from jcnoir/master

Fix : Do not re-download the first playlist song cover
Merge pull request #279 from jcnoir/master

Improve album cover fetching
Minor Grace note cover fetch
- Commit the removal of the user ID from preferences
Improve robustness to : java.lang.IllegalStateException: Fragment PlaylistsFragment not attached to Activity
Merge branch 'master' of https://github.com/abarisain/dmix