Dashboard documentation/help

[daviddoria]

Maybe I'm missing it, but I don't see any instructions for using the dashboard? Not everyone is using the same revision control (github, google code, etc), so maybe a "how to" and an "expected result" for a few different configurations would be useful? It looks like the latest commit message gets posted to the Source Code column? And it looks like the title of the latest blog post gets posted to the Blog column? Is this done automatically even with all the different systems being used?