[FEATURE] Scaffold artist creation
[FEATURE] Add clientside CRUD for artists
[FEATURE] Send all artists json on GET
[FEATURE] Can update and delete artists
[BUG] Fix broken label route
[FEATURE] Can update artists
[BUG] Can delete releases again
[REFACTOR] DRY ember models
[REFACTOR] Make artist resource
[FEATURE] Client can attempt to create a release through an artist