Added "jad" theme

Added a theme that includes user, hostname, directory, git status, time, and command number. The git status includes emoji to indicate dirty/clean repo status. If that's an issue with compatibility, let me know and I can update it to just use ASCII characters.

![screen shot 2013-06-20 at 12 35 56 am](https://f.cloud.github.com/assets/19540/679644/1f105bca-d974-11e2-9355-9f2feef7e605.png)