Change font to PT Sans

Offering up the work to suggest PT Sans as a more apt font for the job. PT Sans is distributed free under the SIL Open Font License. More information regarding the license can be found at http://www.google.com/webfonts/specimen/PT+Sans

Preview @ 100%
![Screen Shot 2013-01-30 at 11 37 10 AM](https://f.cloud.github.com/assets/2708892/111571/72b68598-6afb-11e2-8238-bd5c945d3713.png)

Preview @ 400%
![Screen Shot 2013-01-30 at 11 37 36 AM](https://f.cloud.github.com/assets/2708892/111578/7dc6b372-6afb-11e2-8dae-0ad20f158a69.png)