Theme Cleanup

- rename asset directories to more ambiguous ‘styles’ and ‘scripts’;
- grab latest hljs themes and convert all to stylus;
- import hljs theme into main stylesheet;
- set max-width on readme images Fixes #94;

![screen shot 2014-08-27 at 11 47 57 am](https://cloud.githubusercontent.com/assets/2289/4065458/c0c78780-2e1a-11e4-8633-95585c7260ca.png)