first merge: 8/21

So I managed to get the sessions ctrl going along with the authentication, session routes and a User model. Take a look at it. If there's anything we want to change we can discuss and I'll be happy to edit it. Still pending some migrations and needs a redirect_to in the authentication, but we haven't made any views yet so I just left it. Getting the trip rolllllllliiiiiiiinnnggggg!