lightdm-gtk-greeter: Version bump 1.6.0
lightdm: Version bump 1.7.15
lightdm: Version bump 1.7.16
lightdm: fix compile without libxklavier & cleanup
Merge branch 'lightdm'
lightdm-gtk-greeter: complain if lightdm-gobject is not around
Merge remote-tracking branch 'origin/master'