Add the initial structure around rbpkg.
Review Request #7657 — Created Sept. 24, 2015 and submitted — Latest diff uploaded
This adds the command structure for rbpkg, the new package installer for Review Board. Right now, there aren't any commands available, but those will come later. rbpkg's command structure is modeled heavily off of RBTools. Some may wonder why we're building our own installer, so I provided a bunch of rationalization in the README.md.
Ran rbpkg. Got help output.
There are no commands yet, so.. we'll see how well it works in practice!