Added budspencer theme.

This theme is for people working in vi mode and want to see, at a glance,
whether they are in INSERT or NORMAL mode. In addition, budspencer theme
provides a noticeable prompt in order to find commands quickly when
scrolling back within the terminal.

Feel free to merge it.

![scrot-2014-05-12-121025](https://cloud.githubusercontent.com/assets/2333069/2943079/f7692fa2-d9bd-11e3-890b-1936e8dba1f5.png)