xmonad: add takeTopFocus logHook
This is required to make IntelliJ (and supposedly all other Swing
applications) properly notice that they've recieved the
focus. According to [0], the problem is that "xmonad does not follow
ICCCM and ignores WM_TAKE_FOCUS protocol", but the patches on that
ticket haven't yet been accepted, so the function was added to
xmonad-contrib as a workaround until something happens in xmonad
proper.
[0]: http://code.google.com/p/xmonad/issues/detail?id=177