Update README to include syntax highlighting for multiple languages

I added syntax highlighting within the README file for multiple languages. These include HTML, CSS, and JavaScript. There are a few code examples, though, that came out a little weird. They can be seen here. 

![screen shot 2013-10-12 at 12 15 23 am](https://f.cloud.github.com/assets/1124762/1319558/60186006-32f5-11e3-8866-57f7df3920c5.png)