Merge 'HokieTux' Theme

Hey!

I just pushed my custom theme to my fork of oh-my-zsh, and figured I would submit a pull request in case you are interested in adding it to the official distribution. I couldn't find a theme that had the set of features I wanted, so I made my own.

It has: git branch, git status, etc., as well as right-aligned history number, time executed, and return code. Here is a quick screenshot of executing a few git commands in a repo:

![hokietux_theme](https://f.cloud.github.com/assets/569571/486717/7ec67da8-b933-11e2-80ad-4a0cb7b03844.png)

Let me know if you have any questions / issues, or need more information!

Cheers,
Ben