renamed some files, reenabled rr for shadowrays

and introduced debuging window for debug pixel
going now in s motion trough pixels when rendering

also somewhat more verbose when printing render time
doing now more russian roulette on shadow rays

by computing possible contribution first and using it to set rr
probability
some meshes suck, so we do normalize normal
added class to compute std of luminance of last 10 samples
using now std of last 10 samples do compute RR probability of shadow ray
printing now timings to file with same name
got rid of nan problem

before I was taking sqrt of negative numbers.
Due to float imprecision, M2 might drop slightly below 0
some minor changes
fixed whitted integrator for area lights
doing some experimental stuff
Merge branch 'master' into bsp_optimal_axis

Conflicts:
	rt/src/rt/Main.java
refactored some Bounding box stuff so it makes more sense

also added test coz I suck -.-
trying now way more split axis