updated the README.md and added a new picture, showing some implemented techniques
just added a new line to the README.md
hallo
dynamic scene over console parameters
removed the interface PrimitiveObject, since it isn't needed anymore, and just creates confusion, most of the methods are still in the respective subclasses, maybe they will be needed sometime...
made the filname argument more flexible, so that now every path is possible, the material file has to be in the same directory, like the obj file
fixed a warning and the rendering speed now doesn't shows the average rendering speed, but the actual speed(since last showing)
just a small fix, where the final rendering time wasn't right anymore
Merge branch 'master' into MotionBlur

Conflicts:
	smallPT_projectACG/GSphere.hpp
	smallPT_projectACG/SDLViewer.cpp
	smallPT_projectACG/SDLViewer.hpp
	smallPT_projectACG/main.cpp