Changes

We would love to have a tinderbox [thttp://en.wikipedia.org/wiki/Tinderbox_%28software%29 Tinderbox] image (e.g., VM) for testing and building on the Mac, based on the [http://www.opensource.apple.com/darwinsource/ freely-available OS X source]. Would you love that too? (Also, we'd like to get it wired into Ben Hearsum's (bhearsum) [http://en.wikipedia.org/wiki/Buildbot buildbot ] system.)