adds normals

Signed-off-by: tgfrerer <tim@poniesandlight.co.uk>
Merge branch 'further_tests' of github.com:tgfrerer/ofxGL3Renderer into further_tests

Signed-off-by: tgfrerer <tim@poniesandlight.co.uk>

Conflicts:
	testGL3Textures/src/testApp.cpp