When making request on a base controller, verify token instead of session

[vincentcourtois]

Context

• In the previous versions of the Virtuatable Core, we checked the session of the user when getting query on the API
• We've currently implemented an OAuth system fully working

Needs

As an API user
I want to be able to authenticate on the API using my OAuth token
So that I can show that I have the permission of the user to manage its data

Notes

• Check the existence and the validity of the tokens

[vincentcourtois]

1. Modify the declarators helper to check token instead of session
2. Replace the Session helper to make a Token helper checking the correct parameter
3. Change the way the account is inferred in the Accounts helper
4. Create an OAuth token factory and use it in the tests
5. Fix the tests of the base controller and the other controllers to work correctly