Add test directory with gulpfile.js and example project.
Add gulp commands to README.
Add DirectionalLight class.

We will probably use this over the PointLight class.
Add Object3D matrices and Matrix4 setPosition() method.
Add Quaternion class.

Add support methods and objects to Matrix4 and Vector3. This removes
the pain of handling rotations.
Add Matrix3 class.

Needed for normal matrices.
Rename AABB to Box3 and add box-box intersection methods.