Added my own theme

Just finished my first theme for zsh, maybe some others find it as useful as I do:

[![screenshot](https://lh4.googleusercontent.com/-QVfWH_gGYNw/TuEWUlC0YMI/AAAAAAAABKU/Vu8pl7hT7ek/s682/oh-my-zsh-theme-koraktor.png)](https://lh4.googleusercontent.com/-QVfWH_gGYNw/TuEWUlC0YMI/AAAAAAAABKU/Vu8pl7hT7ek/s682/oh-my-zsh-theme-koraktor.png)

It consists of a clock symbol and the current time (24h), the current path (limited to three sub-paths) and some Git information. Besides the usual staged (a yellow-greenish plus) and unstaged (an orange asterisk) markers it adds two addional symbols. A green checkmark for a clean workdir (untracked files are igored) and an orange `m` for unstaged submodule commits. The screenshot should give a good impression on how it looks like in action.

PS: Sorry, no support for other VCSs.