Upgrade bigbluebutton_rails, improve meeting creation
Upgrade bigbluebutton_rails, improve meeting creation

The biggest change is a fix to issues that would make room inaccessible
if the server didn't respond for a while or had its secret changed.

mconf-rnp/mconf-web,mconf-rnp/mconf-web,mconf-rnp/mconf-web,mconf-rnp/mconf-web