[Xmonad] Freeze for 0.4

[Spencer Janssen]

We're planning to release 0.4 over this weekend.  In preparation for the
release xmonad, XMonadContrib and X11-extras are under a feature freeze.
Feel free to send bug fix and documentation patches, but please keep new
feature patches to yourself until after the release.

If there are any important issues that should be addressed before 0.4, now is
the time to speak up!


Cheers,
Spencer Janssen