Fix incorrect Entity subclassing of Object3D.
Convert Face/Quad classes to index-based geometry.

Add colors to Face/Quad.
Move face normal computation to Geometry.
Add Color math operations (add, multiply, multiplyScalar).
Add Camera class.

Equivalent to three.js’s PerspectiveCamera.
Include bundle.js in build step.
Add gulp-replace.
Add replaceAll gulp utility.

Project-specific minification.
Add Renderables (Vertex, Face, Quad, and Object).
Add Quaternion setRotationFromMatrix() method.

Needed for Camera lookAt() method.
Fix incorrect Matrix4 initialization.