Added peacock colour scheme and expanded monospace font stack.

Changed the code theme to my 'Peacock' colour scheme. It's received good reviews for the Laravel 4 docs so far :) I also updated the monospace stack a little.

Here's a screenie!

https://www.evernote.com/shard/s196/sh/c98c1a20-e727-4d7e-b3c1-834deebe9b63/19e0c85dc1b172a97bf8d0a9b0673fb7

Great project man :)