Core support for multiple commits per review request in Review Board

[Mike Conley]

As mentioned in today's workflow meeting, a student has started preliminary work on supporting multiple commits per review request.

He's posted a thread on reviewboard-dev soliciting questions, feedback, suggestions.

This is likely relevant to our interests.

https://groups.google.com/forum/#!topic/reviewboard-dev/2MuigbF_-X8

-Mike