Add documentation about how to install and run tests
Review Request #2996 — Created March 21, 2012 and submitted
These instructions are probably incomplete -- I may have already had some of the necessary packages install on my system for other work I'm doing, and I may be forgetting some of the paths I took when installing. But these definitely cover the pain points I had. Also document the command for running the tests, which I didn't know and had to ask for.