Add super clean, elegant theme (feross)

SCREENSHOTS:

**Dark terminal theme:**

![feross-dark](https://f.cloud.github.com/assets/121766/29458/37d83af2-4d82-11e2-8722-9ad6c830ee3a.png)
(http://imgur.com/wzZO6,rxHHO#0)


**Light terminal theme:**

![feross-light](https://f.cloud.github.com/assets/121766/29459/5c2ac816-4d82-11e2-9c3b-5380d238069c.png)
(http://imgur.com/wzZO6,rxHHO#1)