[xmonad] noModMask

[wagnerdm at seas.upenn.edu]

I've got a pair of patches sitting on my hard drive that removes  
noModMask from xmonad-contrib and bumps the dependency on the X11  
library up to the version that includes it. User configs should not  
need to change -- the module that used to define noModMask now simply  
imports and re-exports it. Any complaints about pushing those to the  
public repo?

If not, I'll push them in, say, five days.

~d