Docs: create new callout classes

This pull request adds two new callout classes to the docs.

All existing callouts have been converted and few new ones have been added.

Colors:
![calloutfam](https://f.cloud.github.com/assets/3535675/709463/3f7e38ce-de69-11e2-8e99-2544424923a1.png)

Still open to any thoughts!