UC-138 Update the user_fbconnect table and code that accesses it

Changes to record all the data necessary to disambiguate Facebook users now that we don't get a universally unique ID.

https://wikia-inc.atlassian.net/browse/UC-138
Can you combine these?  Does it reduce run time?

```
ALTER TABLE user_fbconnect
   ADD COLUMN user_fb_app_id bigint(20) DEFAULT 0,
   COLUMN user_fb_biz_token varchar(255) DEFAULT '';
```