Sampler added and make an image!
lights now boxes.

room box added. objects have an emission rgb. fixed intersect bug, and
now checks for begin behind ray origin. Added radiance function ready
for recursion.
iterative radiance
Revert 4c2ce90..cd7e7ff

This rolls back to commit 4c2ce90e2f1348991646e2619b4a71ce6d084858.
Revert cd7e7ff..b22b5d6

This rolls back to commit cd7e7ff1448fcb1ae491015a6d97fce34effb936.
point light source with 3 bounce reflection
planes, point lights, flux
C code for intersects, bugs

Optimised shadow rays, fixed dumb logic. C for face intersect.
Can move the camera and make a movie
Merge branch 'point-light'