some failed attempts to creat a bump map feature
fixed alternative BSPAccelerator intersect method
adapted area light integrator according to hints from mm
prettified some code in glossy

but worse runtime
can now use bump maps on materials!
added some random normal map for testing
Merge branch 'bumpmap'

Conflicts:
	rt/src/rt/materials/Textured.java
	rt/src/rt/testscenes/TextureTestScene.java