Merged metabrainz/mmd-schema into master
Merged metabrainz/mmd-schema into master
Regenned classes for MBS-7551 (add tags to instruments, series & area)
Merge remote-tracking branch 'ijabz/master'

* ijabz/master:
  Regenned classes for MBS-7551 (add tags to instruments, series & area)