Reject reserved database names.
MulticonferenceUrl can be an array, tried in order.
Createdb: Disallow reserved DB names, improve DB detection.
jqueryCDN works even over https.
Createdb nit.
Default conference name derives from database name.

Better than "YourConfI". Also, use the database name as the
conferenceId, a new option set in S3 metadata.
Set paperSite correctly from request.