Add "Review URL: ..." line to commit messages.
Tighten up 'findBug' regex to prevent closing merely referenced bugs.

This doesn't work because github's bug-closing algorithm currently
closes any referenced bug once the "fixes" flag has been triggered once.
But should that bug get fixed, this should work as advertised.
Combine all 'Fixes" directives with the final "Closes" line.
Tighten up the 'findBug' regex even further (require word boundary).
Add period to "Closes" line.
Remove last line if it only containes "Fixes" directives.

We already combine them with the final "Closes" line.