Facebook email verification

This PR gets the client ready for our facebook email verification system that augments the giveaway.  It adds an action-link that will be used in the verification email that we send to users, and it introduces the 'invalid_fb_email_token' and 'fb_email_unverified' reward states.
There needs to be content for the "invalid_fb_email_token" state here also, or add it to the generic error state.

![screen shot 2014-11-12 at 11 47 00 am](https://cloud.githubusercontent.com/assets/3108007/5017394/46b8a9e0-6a62-11e4-87ac-73da9a159289.png)