Makes the code so much nicer imho...

expand Matrix3 with set, identity, copy, multiplyScalar, deteminant, clone;  Matrix3/4.getInverse will now optionally throw an exception; start Matrix3/4 unit tests

Official comment from VM guy is that it isn't needed.

Still waiting for an "official" recommendation from a VM guy though.

Also moved some more ui.js styles to the app's css.

I tried to replace the box.js with CubeGeometry but I guess material.side is still not implemented.

WebGLDeferredRenderer: made attenuation parameters properties of AreaLight instead of hardcoded constants.

Up vector can go outside of the shader. Attenuation can be computed only for lit pixels.

Also removed magic 1.5 constant in diffuse term.

Using original ArKano22's way:

http://www.gamedev.net/topic/552315-glsl-area-light-implementation/

Also added forgotten AreaLight.js