rapid7/metasploit-framework — pull request #3744 by hmoore-r7 (2014-09-03 16:33:46+00:00)
Title: Experiment: Move Rex to a Gem

I don't expect this to get merged, as it would change our workflow a bit (and librex currently treats metasploit as upstream), but it proves that cutting it over as a gem is doable.