Created codepen.io embed theme

I've produced a [Codepen](http://codepen.io) embed theme for use on my blog and thought it may prove useful to the community.

# CSS
highlight.js version is first followed by actual Codepen embed
![screen shot 2013-11-05 at 11 08 17](https://f.cloud.github.com/assets/1579511/1472828/9ffc64c4-460a-11e3-8617-cafdf7b4ad94.png)

# JS
Actual Codepen embed is first followed by highlight.js version
![screen shot 2013-11-05 at 11 08 50](https://f.cloud.github.com/assets/1579511/1472831/b203f10a-460a-11e3-9e37-2424a473ca63.png)

# HTML
highlight.js version is first followed by actual Codepen embed
![screen shot 2013-11-05 at 11 11 36](https://f.cloud.github.com/assets/1579511/1472855/16f3f56a-460b-11e3-98c9-f41d283dc8bc.png)