- 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.

Just one hardcoded shader for the moment. Everything needs to get cleaned / bugfixed / optimized.

Otherwise things are very much work in progress, expect everything to be broken.

Small optimizations: skipped flattening in 3x3 matrix inversion and uploading camera position uniform only for materials where it's used.

This should affect only use cases with lots of animated objects (unlike current performance tests where object matrices are not updated).

WebGLRenderer now as fast as WebGLRenderer2.

https://github.com/mrdoob/three.js/pull/97

* memory and speed optimizations in Matrix4.makeInvert3x3() (moved Matrix4.m33 to WebGLRenderer._m33 since it is
  only used there and only for a single Matrix4)

* memory and speed optimizations in Matrix4.makeInvert3x3() (moved Matrix4.m33 to WebGLRenderer._m33 since it is
  only used there and only for a single Matrix4)

added Matrix4 "setter" functions: setTranslation, setScale, setRotX, setRotY, setRotZ, setRotAxis; to be used in optimizing Object3D.updateMatrix.

slight speedup in Matrix4.rotationAngleAxisMatrix by cutting down object lookups and redundant multiplications

For the moment just things that are executed every frame in WebGLRenderer.render.

Continuing with quest to minimize creation of new data structures. Should instead create per class/object structures and just reuse them (as gman does in ThreeD). Main goal is to avoid annoying garbage collection pauses.

Let's hope it didn't break something (could be if some code was dependent on cloning of return values of "flatten" or "makeInvert3x3", though from what I checked these are just used to set typed arrays uniforms).

Added `boundingBox`, `boundingSphere` and `computeBoundingSphere` to Geometry.

`THREE.Matrix4()` → `THREE.Matrix4(  n11, n12, n13, n14, n21, n22, n23, n24, n31, n32, n33, n34, n41, n42, n43, n44 )`

Matrix4.transformVector4 ⟶ Matrix4.multiplyVector4

Implemented gero3's Matrix4.transformVector3 optimisation ( http://jsperf.com/diff-in-speed-for-three-js ).

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

Optimised Particles projection in CanvasRenderer.

* Added `camera_orthographic` example.

* Minor fixes (Geometry normal calculation)
* Isolated Matrix3 code into `Matrix3.js`
* README and TODO updated

Added rudimentary 3x3 matrix class (just transpose, as this is needed for normal matrix).

* `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

 * Bug Fix: Matrix4.makeInvert was calling a non existent scale method. Replaced with multiplyScalar.
 * Bug Fix: DirectionalLight wasn't normalizing the direction vector.
 * Added lights to the scene for test.html