Implement basic Raven consent app
Implement the basic Hydra consent flow. The consent app implicitly grants all scopes asked for at the moment to mirror existing login flows. This will have to change in future due to https://github.com/ory/hydra/issues/772.
TESTING NOTES Spin up with the usual docker-compose up devserver command and then try to issue a token with ./scripts/create-token.sh.
The developer settings take you to the demo Raven authentication site.
Closes uisautomation/experimental-oauth2-deploy#1