Update py-cltter to 1.0.2.

Overview of changes between 1.0.0 and 1.0.2
===========================================

* Fix an import error of the PyCairo C API [Bastian]
* Use the GClosure variants for the Alpha API [Emmanuele]
* Update the examples [Bastian, Emmanuele]
* Allow iterating over the actors references by clutter.Behaviour instances
  using the Python iteration syntax [Emmanuele]
* Override __str__ and __repr__ slots for clutter.Path [Emmanuele]
* Add back clutter.Actor.get_allocation_geometry() which was erroneously
  removed from the bindings [Emmanuele]
* Update the build so that PyClutter works with Clutter 1.2 [Bastian]
* Add support for the X11 and GLX specific API, under the clutter.x11 and
  clutter.glx sub-modules, respectively [Bastian]
* Add more (optional) parameters to the clutter.Animation constructor [Bastian]
* Add __str__ and __repr__ slots for many boxed types [Bastian]
* Add richcompare slot for clutter.Color, clutter.Path and
  clutter.ActorBox [Bastian]
* Allow iterating over a clutter.Path [Bastian]
* Allow implementing a clutter.ChildMeta in pure Python [Bastian]
* Bind clutter.Units [Bastian]
* Allow implementing clutter.Scriptable in pure Python [Bastian]
* Use a custom codegen script to fix bug #1827 and allow overriding the
  Python name of a C method [Bastian]
* Add docstrings for all methods [Bastian]

(obache)