Add Facebook Feature: Accommodate Facebook Logins as well as Zooniverse Logins

[shaunanoordin]

OPEN FOR DISCUSSION: FUNCTIONAL SPECIFICATION, TECHNICAL IMPLEMENTATION

Facebook Feature Update.
Required functionality for Minimum Viable Product.

NOTE: This is specific for the User Story wherein the user accesses Galaxy Zoo from Facebook. i.e. this assumes that the user is logged into Facebook, and proceeds to access Galaxy Zoo as a Facebook App.

• Some way, some how, we need to accommodate two different kind of logins when a user accesses the Galaxy Zoo FB App. One is the user's FB login, the other is the user's (optional?) Zooniverse account.

To Discuss:

• How exactly are we going to implement this? How is it supposed to work?