Remove concerns directory
Add api/v1 namespace
Add base api controller
Add class for APIController
Add devise gem
Add Devise config
Add scoped api/v1 sessions_controller
Add create method for sessions
Add helpers for ensuring authentication
Add before_filter to make sure user is authenticated
Use devise for login authentication
Let devise generate user model
Add devise users back to the api
Update schema with users and fix typo in sessions_controller
Use null_session (default value) with protect_from_forgery
Ability to seed users
Add name and role to users
Add role to seeded users
Add authentication token to users
Add custom implementation to generate auth tokens