Initial svn import of clutter-box2d.

	* box2d-build-and-install-shared.patch: a patch for box2d's build
	system making it build a shared library and install a usable header.

	* clutter-box2d.h:
	* clutter-box2d.cpp: actual box2d glue group.
	* clutter-box2d.pc.in: pkg-config file for clutter-box2d
	* examples/blockbox.c: a small framework for adding more clutter-box2d
	tests.

	* autogen.sh: distribution boilerplate stuff, mostly lifted from
	clutter-cairo with minimal search and replace.
	* configure.ac:
	* Makefile.am:
	* examples/Makefile.am:
	* AUTHORS:
	* COPYING:
	* INSTALL:
	* README: