Sessions and JWTs

[sirwolfgang]

I am working on a rails/jwt integration (sirwolfgang/jwt_keeper), which I would like to integrate with sorcery.

One of the key things is that the tokens are not stored in sessions, but are handled by the frontend and stored in local storage. (Depending on how you use them) I bring this up because currently sorcery default auths by the login_from_session then by login_from_other_sources. I think it would be favorable to make this slightly more modular by not having a session based default, but rather have login_from_sessions be one of the (priority loaded) methods. This would allow pretty seamless integration with completely other flows like JWT(which could use a few different approaches as well).

[Ch4s3]

@sirwolfgang this is related to #70 and its on the roadmap, please check out the discussion there and weigh in!