RayTracer code
Raytracer
Unoptimized Raytracer working
Merge branch 'master' into raytracer

Conflicts:
	src/pcm/geom/Vector3D.java
Merged John's simple package with the new raytracer code.
1. Fixed John's code: Main had compilation errors.
2. Updated 'simple' package to use a new Vector class.
3. Raytracer for sphere works as expected.
4. Work on Polygon surface is still in progress..