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
We don't use it now, but I think its useful if someone wants to know if a delete actually took place.  Its such a minimal amount of code I'm inclined to keep it.