And still readable code...

It's enough to clone just for hits, no need to do it for every face.

Removed some clone() calls while still keeping the code somewhat pretty.

Ray.js: The bounding sphere check wasn't considering flipSided/doubleSided when the origin was inside the sphere.

Reverted to previous WebGLRenderer.setTexture code. Now that Chrome 12 is out, it should be working?
Commented out troublesome object-behind-camera check in Ray.js

Object3D::globalMatrix ⟶ Object3D::matrixWorld

Added hierarchy examples.

I need to look at this objectMatrix::extractRotationMatrix() thing. I don't think this works like that... isn't the scale applied to the rotation in the matrix?

- 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.

Matrix4.transformVector4 ⟶ Matrix4.multiplyVector4

This commit fixes what that change broke.
Removed chromatic distortion from WebGL reflection/refraction.

* Fixed a bug in Ray.intersectObject: face.normal needs to be transformed using matrixRotation otherwise rotated objects fail
* A bit nicer example

Unimpressive example added `interactive_spheres.html`

Work in progress refactoring ClickResolver.js to Ray.js