Improve Zamboni API Dashboard (bug 963072)

- Group APIs belonging to the same module
- Add vertical line corresponding to production pushes

**Before:**
![screen shot 2014-01-05 at 18 44 11](https://f.cloud.github.com/assets/187006/1987214/75b983ba-8456-11e3-916e-2bff91e02dd2.png)

**After:**
![screen shot 2014-01-05 at 18 46 53](https://f.cloud.github.com/assets/187006/1987215/75bc5db0-8456-11e3-9fbb-c9fe4681e727.png)