Add Object3D add()/remove() methods.
Convert game scene to Object3D.

Fix lights being added to render data.
Simplify Track meshes generation.
Extract Polyhedron test from main.js.
Add DOM manipulation utility functions.
Add browserify error-handling to gulpfiles.
Promote Vector3 applyQuaternion() method to main project.
Add Object3D various translateOnAxis() methods.
Add basic UI and controls test.
Add three.js overdrawing for anti-alias gaps.
Add Island test.
Remove batch rendering.
Add Audio drums test.