Added get_python_version.
Code is now mostly under 80 chars width.
Implemented add2virtualenv.
Fixed minor logical issue.
Moving back to the original directory when using work on.
Hooks are getting executed now!
Implemented rmvirtualenv.
Implemented show_workon_options, _lsvirtualenv_usage and lsvirtualenv.
Implemented showvirtualenv.
Added a explanation of why this project exists to the README.