new C++ demo: realtime_dragon.cc class Container moved to its own source file (from kdtree.*) new directory for models and Makefile which downloads and prepares them fixed python module path in some forgotten demos ShapeList moved to scene.h

demos/ModulePath
demos/*.png
demos/kdtree.obj
ccdemos/*.png
ccdemos/spheres_shadow
ccdemos/realtime
ccdemos/realtime_dragon
models/bunny
models/happy
models/dragon
bin/*