Log Message:
Update clutter-gtk to 1.6.0

Clutter-GTK 1.6.0                                                    22/09/2014
===============================================================================

Changes since 1.5.4
        # Revert to the X11 backend by default; the GDK backend is not ready
          for Wayland, yet
        # Improve support for Wayland

List of bugs fixed:
        #736564 - problem with gtkclutterembed and gtkstack under wayland

Many thanks to:
  Bastien Nocera

Clutter-GTK 1.5.4                                                    21/08/2014
===============================================================================

Changes since 1.5.2
        # Improve initialization sequence
        # Require GDK backend when using Clutter-GTK
        # Use subsurface protocol when using Wayland

List of bugs fixed:
        #695737 - Add wayland support
        #734905 - Unpainted GtkClutterActor with the GDK backend
        #734906 - Unpainted GtkClutterEmbed with GDK backend

Many thanks to:
  Jasper St. Pierre, Lionel Landwerlin, Bastien Nocera, Olav Vitters, Piotr
  Drag, Rob Bradford

Clutter-GTK 1.5.2                                                    19/02/2014
===============================================================================

Changes since 1.4:
        # Allow falling back to Cairo-based embedding of GTK+ widgets if
          the Clutter-X11 API is not available.
        # Support window scaling factor in GtkClutterEmbed.

List of bugs fixed:
        #724055

Many thanks to:
  Adel Gadllah, Bastien Nocera