Merge branch 'hotfix/0.0.3'
Create Artist (and related data) models, admins, and migrations.
Artist, ArtistCredit, Release, and ReleaseGroup, plus interactions/migrations.
Merge branch 'feature/music-artist-model' into develop
Merge branch 'master', remote-tracking branch 'origin/master' into develop
Merge branch 'develop', remote-tracking branch 'origin/develop' into develop