Adding Solarized theme

Adding solarized light theme and tweaking the dark one.

![solarized-dark](https://cloud.githubusercontent.com/assets/227817/2926463/e1f5e772-d75c-11e3-9ed7-97480c3c919c.png)
![solarized-light](https://cloud.githubusercontent.com/assets/227817/2926464/e1f69140-d75c-11e3-8b92-094540bfffe6.png)