Add support managing base images to controller API (#434)
Create controller base API (#434 note-3)

* Define CONTROLLER_REL and make dynamic header links
* Create new ControllerRestApi that extends current RestApi
* Add helper to urlize model verbose_name
* Allow register a view to controller REST API
Include both base links (registry and controller) (#434 note-6)
Merge branch 'feature434' (#434)