[xmonad] Gnome3 and xmonad

[Jens Petersen]

> ps Note however gnome-session seems a bit "sensitive" yet about other
> wm's (bug perhaps?) and sometimes show a "Fail whale" dialog - I guess
> because it didn't notice the wmgr... but I have just mean ignoring/minimizing
> though - until I have time to look further into it.

It was my bad for xmonad: startup script (xmonad-start) was exec'ing xmonad
which made gnome-session think that the window manager had terminated.

(For bluetile, the WMName seems to be wrong: sending a patch upstream.)