Is not used so much anymore so we can have it with a less obfuscating syntax.

Do not merge, this is very experimental, not sure about correctness, also tons of unsolved things.

* Realised that canvas.context has a createPattern method which allows CanvasRenderer to support tiled textures \o/ (Examples where there is a CanvasRenderer and a WebGLRenderer at the same time may get errors because CanvasRenderer now uses texture.needsUpdate too).

Using * ( 1 / scale ) instead of / scale in JSONLoader.

Updated GeometryUtils.merge with Face*.color changes.

I don't remember when was the last time I used them. Current Web Developer Tools do this already for you.

Color::updateRGBA ⟶ Color::updateRGB

Object3D::matrixNeedsToUpdate ⟶ Object3D::matrixNeedsUpdate

It works more or less the same as lines:

  - particles are passed to ParticleSystem object as geometry
  - material is ParticleBasicMaterial (textures should be supported, not tested yet)
  - geometry can be updated by setting "__dirtyVertices" property of the geometry

This is necessary for having multiple materials using the same shaders with different parameters.

GouraudShading and PhongShading ⟶ SmoothShading

CanvasRenderer/SVGRenderer: More code clean up and optimisations.

Almost done porting CanvasRenderer to the new material system (plus some performance gains on the way :D)
`Color` now handles hex with no alpha byte (probably there is a nicer way of doing it...)

* `CanvasRenderer` and `SVGRenderer` basic lighting support (`*ColorStroke`/`*ColorFill` only)
* `Renderer` > `Projector`. `CanvasRenderer`, `SVGRenderer` and `DOMRenderer` do not extend anymore
* Interactivity base code (hdi folder). To be refactored... ([mindlapse](http://github.com/mindlapse))
* Added `computeCentroids` method to `Geometry`
* Included `Stats.js` directly in the `/examples` folder to avoid the need of internet for playing around

- Minor tweaks

* Additional `Matrix4` and `Vector3` methods

- Matrix4.lookAt fix (CanvasRenderer and SVGRenderer now handle the -Y)
- Color class now using 0-1 floats instead of 0-255 integers

- Object3D.overdraw = true to enable CanvasRenderer screen space point expansion hack.