Update main.css for doc styles

Did a pass on the docs, I couldn't read the "options" sections of pages as everything was the same colour. 

Also added normalize CSS to smooth out some general issues like horizontal scroll in certain situations.

If there are any issues I can provide further edits and troubleshooting.

Here is the proposed look in this PR:

![screen shot 2014-11-25 at 12 05 16 am](https://cloud.githubusercontent.com/assets/1929082/5178266/cf733790-7436-11e4-8e34-30b314827319.png)
![screen shot 2014-11-25 at 12 03 20 am](https://cloud.githubusercontent.com/assets/1929082/5178272/d5589812-7436-11e4-837e-746c7aafceae.png)