change withUrgencyHookC api
change withUrgencyHookC api

Now it takes an UrgencyConfig record type.

darcs-hash:20080821052046-78224-6c4d5419c421596ccd604e1851b0e2594ffd653c

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