X.L.Monitor: changes in message passing
X.L.Monitor: changes in message passing

- transform mbName (Maybe String) to name (String)
- slghtly change semantics of messages, document it

darcs-hash:20081226220851-3ebed-4d064ed9c6f1ada44dc76851c2bfa34d5d75b484

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