Add GPA to education sections

Hi, big fan of the theme. 

Dunno if you're interested, but I've made a small addition to show GPAs. Feel free to suggest any changes. 

I'm also planning to make a few more changes: 
- more date formatting (e.g. Education in *MMM, YYYY* format)
- links for publications
- support for gravatar profile pic

Let me know if you're interested, no worries if not :)


You could use `<i>` tag for italics instead of adding a new class.

I did test this out, it looks something like this
![screen shot 2014-09-20 at 11 22 39 am](https://cloud.githubusercontent.com/assets/1861842/4344323/d6128f1e-4089-11e4-957b-dcfa1915be6c.png)

Which doesn't imply clearly that it is a GPA, I'd rather prefer something like this

![screen shot 2014-09-20 at 11 22 05 am](https://cloud.githubusercontent.com/assets/1861842/4344325/eb8210e0-4089-11e4-9887-e6d6d07fbfa5.png)

What do you say ?