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
Is the logic here reversed? It looks like before if there were ids we'd set ```$isConnected = true;``` and ```$prefTab = 'fbconnect-connect';```. We seem to be doing the opposite here.