0.3 release:
    * stable contrib repo tarball
    * haddocks for core and contribs on xmonad.org
    * tag xmonad
    * tag X11-extras
    * tag X11
    * more QC tests


- possibles:
    - use more constrained type in StackSet to avoid pattern match warnings
    - audit for events handled in dwm.

- related:
    - xcb bindings
    - randr