Remove serif fonts from 'overall' bar

The serif 'overall' bar really feels out-of-place with the sans-serif body.  In my opinion, going with the inherited font for the status and a sans-serif monospaced font for the summary improves the look.

![ok](https://f.cloud.github.com/assets/184976/2489805/2a13dc58-b179-11e3-9003-fc5b6263d5d9.png)
![fail](https://f.cloud.github.com/assets/184976/2489804/2a12b7a6-b179-11e3-952b-1a93cc49a7fa.png)