feat: add environment configuration.

#118

![screen shot 2014-12-03 at 12 05 46 pm](https://cloud.githubusercontent.com/assets/2622152/5278687/d7710a4e-7ae4-11e4-8035-f38acdaa31b5.png)
![screen shot 2014-12-03 at 12 05 28 pm](https://cloud.githubusercontent.com/assets/2622152/5278688/d77537ea-7ae4-11e4-9aad-d72303963d6b.png)