Added Compare class to store epsilon values and comparison utilities.
Changed defaults for VEC and MAT epsilons.
Added equalsWithEpsilon() method for comparing against default epsilon
in Compare.
Removed fixup in getLength().  Added equalsWithEpsilon()
Fixed test case.
Added comments to Mat.  Added equalsWithEpsilon() for default epsilon
comparison.
Code paths that do floating point comparison now use epsilons from
Compare class.
Added a Vec3 + w constructor.
Added first cut of Mat4 class.
Stub utility class for matrices.
Added some experimental classes to the Attic.
Added equalsWithRelativeTolerance() for floats.