Very nice. Added yet another shiny badge to my github project's README.
It seem's a little too easy to get an 'A' rating. On one of my less polished libraries it pointed out a few issues that I feel should bump me down to at least a 'B'.
Cool.
Looks like bitbucket links don't work though. It runs the report card correctly, but the generated links back to the source all 404.
Sweet. I'm working on something similar, for rating repo management. http://repocheck.com. Your app has great design.