[clutter-box2dmm] (10 commits) ...Demonstration of the exposed get_actor{1, 2}() of Box2DCollision

[Aidan Delaney <adelaney src gnome org>]

Summary of changes:

  70a1919... Exposed collision signal of children of the Clutter::Box2D 
  3369958... Manually wrapped getting the actors involved in a Clutter::
  3f21f48... Release of 0.12.2   * examples/slides/main.cc: Shows how to
  9cee9b6... Bumped up the version of clutter-box2d required by the .pc 
  f428471... Ensure init is in Clutter::Box2D namespace and ensure a com
  bdf012c... Expanded the m4 macros for converting between ClutterBox2DC
  cf4ea3b... Use @CLUTTER_BOX2DMM_API_VERSION@ rather than @API_VER@ in 
  c10bcef... Merged work to expose the signal_collision of a Clutter::Bo
  bf774d7... Not copying the underlying ClutterActor seems to cause g_ob
  8ffa416... Demonstration of the exposed get_actor{1,2}() of  Box2DColl