Better docstring for Intersection
Added bracket assignment to Point, Vector and Normal
Fixed missing self
Fixed missing self
New class: RWLock
Fixed missing self
Renamed variables
Unit tests for brack assignments with Point, Vector, Normal
New function: round_to_int
New classes: Voxel and GridAccel
Timing script for two different implementations of a comparison function
Added a unit test for GridAccel (and Voxel) class