reformat session responses
return logged_in on session response
setup /me for current_user info
Adding APIKey model
Merge branch 'auth-sessions' into token-auth

Conflicts:
	app/controllers/application_controller.rb
Creates access token on user creation
send back access_token after login. client's responsibility to store and re-use
fixing tests
Merge pull request #5 from cremalab/token-auth

Token auth