Adding Code School.
Contributor: Aimee Simone, Developer at Code School, @aimee_simone
Source: internal headcount

Developers: 3 of 9
Front-End Developers: 0 of 3
Technical Support: 0 of 1
Content Developers: 1 of 5

Total: 4 of 18
Merge pull request #157 from aimeesimone/master

Adding Code School.