please expose rhbz_email in flask_fas_openid

[kparal]

In BlockerBugs App we use flask_fas_openid.py for users to log into FAS. We'd need to receive rhbz_email value from the user profile, but currently flask_fas_openid doesn't forward that. Would it be possible to extend it so that it sends us also rhbz_email value?

PS: I know there's fasjson, and we could use it, but it's another service to integrate and depend on, while receiving the value through flask_fas_openid would be much simpler for us. That's why I'm asking if you'd would be willing to include it in there. Thanks!