Make the README more beautiful

@clbustos this uses the newer github flavoured markdown for the docs, which makes this more accessible. Checkout the samples now:

![screen shot 2014-07-23 at 2 56 50 pm](https://cloud.githubusercontent.com/assets/44345/3680973/a131bb24-12b4-11e4-8a75-f7752698970b.png)