Geolocation update

- Using edX color scheme
- Grading with a square root scale
- Using full container width
- Tooltips include percentage

Old
![screen shot 2014-09-12 at 2 35 10 pm](https://cloud.githubusercontent.com/assets/910510/4257056/0065a902-3abf-11e4-82fe-ae5fb47550d0.png)


New
![screen shot 2014-09-12 at 4 52 08 pm](https://cloud.githubusercontent.com/assets/910510/4257057/0375b470-3abf-11e4-9025-f6438eb739aa.png)

@dsjen @marcotuts @shnayder @rocha