Restored full python3 compatibility (hopefully)

Kytten should now be able to run unmodified on both python 2.6+ and 3.1+
Fixed some rendering bugs when updating Document text in 'document.py'
Various bug fixes.

Moved examples to 'examples folder'
Fixed  gl.glPopAttrib bug in glcontext.py
Added 'images' module in kytten to laod textures for use in kytten.
Added a basic working example showing how to use the "new kytten"