Added xmonadPromptC
Added xmonadPromptC

I added xmonadPromptC which takes a user defined list of commands as in Command.runCommand

darcs-hash:20071027014811-7dfdc-72cee3fda3c64db2749b6ab3615856bde0122d2d

jthornber/XMonadContrib,jthornber/XMonadContrib