Moved materials/RenderTarget.js ⟶ renderer/WebGLRenderTarget.js

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

- getters/setters are no more in Vector3
  - object hierarchies thus don't use "isDirty"
  - this was completely killing performance for anything that was touching a lot of Vector3 like creation of meshes and dynamic buffers
  - even without this, performance of hierarchies went up (a lot)

- objects do not get passed renderer anymore
  - camera was almost also removed, but this is useful for LOD (though there may be some cleaner way to do this?)

- material ids are now unified, this makes "geometry.sortFacesByMaterial" faster (thus scene init / GUI blocking is shorter)

- all WebGL examples should work now (render-to-texture has weird lights and in some camera control feels different)

- CanvasRender still broken, despite many efforts :(
   - currently only points and lines work, faces don't show up. I think this may need assistance from mrdoob.

Made 0xffffff the default color on all materials (0xeeeeee was making the AO a bit darker).

* `Particle` now use `ParticleCircleMaterial` instead of `ColorFillMaterial`
* `Particle.size` > `Particle.scale.x` and `Particle.scale.y`
* `SVGRenderer` currently out of sync

- Added (mandatory) video example
- Restructured examples folder

- Added wireframe view on VR demo

- CanvasRenderer supports TextureUVMappingMaterial.
- Moved UVs to Geometry.
- Minor clean up

+ Workaround for WebKit not supporting rgba() in SVG yet
+ Aesthetic changes on the readme file

Added THREE namespace
Camera.x -> Camera.position.x
Camera.target.x -> Camera.target.position.x
ColorMaterial -> ColorFillMaterial
FaceColorMaterial -> FaceColorFillMaterial
Materials are now multipass (use array)
Added ColorStrokeMaterial and FaceColorStrokeMaterial
geometry.faces.a are now indexes instead of links