Add hero with official logo. Yellow makes it POP

Temporary update to bower.io with the official logo.

I'm digging the yellow, but I can be persuaded otherwise.

Desktop:

![Screen Shot 2013-04-23 at 5 14 39 PM](https://f.cloud.github.com/assets/85566/416985/05f37eba-ac5b-11e2-8e4d-f7624cd55509.png)

Phone/IE8:

![Screen Shot 2013-04-23 at 5 14 48 PM](https://f.cloud.github.com/assets/85566/416986/0c6106d2-ac5b-11e2-9b05-2ffebcc7fc3f.png)