gratipay/gratipay.com — pull request #2778 by Changaco (2014-09-23 12:26:44+00:00)
Title: Fix Facebook auth

Should fix https://app.getsentry.com/gratipay/gratipay-com/group/31462979/events/2004780903/. Changes:

- Facebook accounts don't all have a `user_name`, use `user_id` instead
- remove the unnecessary request to get the avatar URL