Bug 739492 - Default key binding for hiding window on OS X does not work.
Bug 739492 - Default key binding for hiding window on OS X does not work.

Add GtkAcceleratorGroup with accelerators for Hide and Hide Others so
that Gtk can process them when quartz isn't handling the accelerators.

GNOME/gtk-mac-integration,GNOME/gtk-mac-integration,GNOME/gtk-mac-integration,jralls/gtk-mac-integration,sharoonthomas/gtk-mac-integration,sharoonthomas/gtk-mac-integration,sharoonthomas/gtk-mac-integration,jralls/gtk-mac-integration,sharoonthomas/gtk-mac-integration,sharoonthomas/gtk-mac-integration,jralls/gtk-mac-integration