Fix EM's Headshot & Update Team Bios

Elaine's headshot from Twitter was busted, so upgraded the photo to a file on our server and update the role descriptions on the About page:
![codemontageteam](https://f.cloud.github.com/assets/226228/1813729/6108457e-6ecf-11e3-863e-d6eeba49ba37.jpg)

cc @emarino13 @courte @tfreet