Added a new theme

[joshkehn]

Theme changes:

• Git is prefixed not suffixed
• Bash history number included
• For the minimalist who enjoys a clean prompt with no clutter

[robbyrussell]

Thanks for sending this across. However, at this point in time... I am not going to be accepting any new themes for a while. My aim is to work out a new solution for how to manage user theme contributions better in the future, but am thinking that 100+ is already too many for folks to browse/select from. :-)

Be sure to follow @ohmyzsh on twitter ( http://twitter.com/ohmyzsh ) to stay tuned for when we might have a good location for such themes.

ProTip: If you have a custom theme and want to use it... you might check out this (poorly documented) feature from pull-request #1111.