accept more windows as docks
accept more windows as docks

Ignore-this: 21d9b406c7e39cca2cc60331aab04873

darcs-hash:20120823124153-76d51-072eab9b52edc18a47d943319875586ae3c2b088

yzhou61/xmonad-contrib,yzhou61/xmonad-contrib,yzhou61/xmonad-contrib