[Xmonad] Removing the X11-extras dependency

[Isaac Dupree]

Don Stewart wrote:
> However, this is a big change, so bumping A.B has been done. And
> 1.3.0 > 1.2.3, so that's fine, according to
> 
>     http://haskell.org/haskellwiki/Package_versioning_policy
> 
> Thanks for raising this.

Yup.  Should it be 1.3.0.0 then?  (I'm not sure quite what's going on 
with that "number of zeroes" issue most recently)

Isaac