filled in body of searchSongsByTags in comments - waiting for implementation in ApiMusic
implemented Song.hasTag
Merge origin/master
Merge origin/master
added comments in SongSearcher.getSongsByUser
added method signature for searchSongsByTags in music.api.ApiMusic
fixed typo in signature for changeRightsOfThisSong
updated searchSongsByTags - now returns local songs with correct tags too (not only remote songs)
Merge pull request #75 from amina196/master

[music] miscellanous changes - cf commit messages