Fix facebook login

[JGAntunes]

We need to update our code set to be able to cope with the new graph API. From profile pics to adding new members. One way of doing this would be to, inside deck itself, when logged in, we could add an "add facebook login" button, that would make an authenticated request with the user' facebook information and then we would add that info to our DB. Allowing him to use facebook login next time.