Add simple metrics for measuring progress

Awesome tool, however, I feel that it is lacking some kind of simple metrics to measure progress.
![bildschirmfoto 2013-06-28 um 17 45 42](https://f.cloud.github.com/assets/1471561/722862/1fe9e592-e00a-11e2-80c2-b08da8c7388b.png)