ModelHook metaclass
WIP
No need for metaclass
Rename Model.normalize to Model.to_json
Normalizers are now Models
Get rid of Array- and ObjectNormalizer custom constructor
Get rid of wrapping class
Tweaks
API Models are serialized and deserialized using cosmic.models
Get rid of make_normalizer
Get rid of unnecessary methods
Fix Schema subclassing for custom fetch_model implementations
Rename index to registry