Feature/formattable operations

This is actually already hotpatched and running on the badges-backend01 node.  It is needed for this badge:  https://badges.fedoraproject.org/badge/what-goes-around-comes-around-karma-i

The trick is for line 33 here:

https://git.fedorahosted.org/cgit/badges.git/tree/rules/packager-karma-01.yml#n33

without this code, you cannot do the ``"%(msg.comment.update_submitter)s"`` substitution there.