Stubs for object positioning

Conflicts:
	src/geometry/Object.cpp
	src/geometry/Object.h
Merge branch 'master' into camera
Prepare handling intersections in object coordinates
Move rays to object space and back to world space

When there's a rotation only.
Intersection computation is now done in object space
Add current render example
Use smaller render size when testing
Merge pull request #14 from merlinND/camera

Object positioning