Merge branch 'master' of https://github.com/andete/madparts

Conflicts:
	MANIFEST.in
	setup.py
loose single dependency on GLU
Merge branch 'master' into extern-darwin
do not call glClear unless we're actually drawing (fails in darwin)
Merge branch 'master' of https://github.com/andete/madparts
Merge branch 'master' into extern-darwin