[xmonad] New module XMonad.Actions.GroupNavigation

[Adam Vogt]

* On Monday, May 10 2010, nzeh wrote:

>Hi folks:
>
>I submitted a patch introducing this new module before, but Adam had some
>excellent suggestions on how to improve it.  I've taken those into account.
>So here's a new patch adding this module to XMonadContrib sporting a
>leaner API and a more efficient implementation of all operations.
>
>Cheers,
>Norbert

Applied, thanks!