Changed exported JS class name in OBJ converter to use the same convention as Blender exporter (use exact case of JS filename, no capitalization).

Changed WebGLRenderer to use 3x3 normal matrix.

Limitations of WebGL lights:

- currently handles only single one of each ambient/directional/point light
- light intensity modifier not yet taken into account
- only diffuse term (this applies also in CanvasRenderer)

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

Changed mesh JS class name generator in Blender exporter to use cross-platform path parsing.
Old version was generating broken class names on Windows (full path was included).

Old version was generating broken class names on Windows (full path was included).

Added multipass multimaterials to WebGLRenderer.

Refactored WebGLRenderer shader to become proto-mini-ubershader (untershader :).

Line width is currently not set properly on Chrome in Windows:

http://code.google.com/p/chromium/issues/detail?id=60124

* Updated TODO

* Added Blender 2.54 exporter. (Crossing fingers so they don't change the scripting system again...)

Extended CanvasRenderer to be able to handle decals (MeshBitmapUVMappingMaterials as secondary materials).

For decals you need to set "decalIndex" property of the material (corresponding to materials index of the original mesh UV material).

Added multimaterials example.

Fixed forgotten sphere smoothing in OBJ converter example.

Experiment to get backwards compatibility with the original meaning of materials array in Mesh (= extra materials are drawn for whole mesh).

Limitations:
 - works just in CanvasRenderer
 - doesn't work for MeshBitmapUVMappingMaterial as secondary material

Added OBJ converter test example.

Modified Three.js to handle converted models:

 - extended WebGL renderer to use texturing
   - broke down model into multiple VBOs according to materials
   - textures are lazy created when images get loaded
     (converter takes care of resizing images to nearest power of 2
      dimensions using 2d canvas)

 - changed material array semantics in Mesh object
    - before: multiple materials were applied to all faces (broken in WebGL, needs multitexturing shader)
    - now: there is only single material per face, but one mesh can have faces with different materials

 - added per vertex normals (to get smooth shading in WebGL)

* `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

Using projection * view * obj matrix to transform vertices in Renderer instead of transforming twice (once by view * obj and once by projection).

  * Added getCenter to Face4

- 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