v0.5 dev

• CubeMap is a single isosphere; it can now layer outputs. We rewrote the cube to work more like a graph that gets defined and then compiled, and the ability to add texture to CubeMap.

• Quad can now accept a texture for each dimension so it can dynamically load textures at different resolutions depending on the player's position by using imagebitmap. Quad class no longer accepts a normal map, you have to use a color map instead.

• Sphere uses a single quadtree. This should improve initialization time and memory.

• Atmosphere parameters are exposed.

• Unit test setup.

• Made some examples.