move away from static fromXXX-style constructors to setXXX style member functions widely used in ThreeJS.

Plane,Box3,Sphere improvements: static constructors, code simplficiation, optimizations.  Box3 made more robust via true empty (+MAX_VALUE,-MIN_VALUE).

implement Plane.js, add to common.js and update Frustum.js to use it instead of Vector4 - issue #2706

This got broken after GeometryLoader got removed, using instead JSONLoader.

Another step towards WebGLDeferredRenderer. It's still quite a mess but at least now code lives outside of the examples (and is reusable, to a degree).

These are first steps toward WebGLDeferredRenderer. This will take a while.

Not needed now that these are in G-Buffers.

This allows to have different per-object Phong materials in deferred shading.

To use FBX converter you must now install FBX SDK Python bindings yourself from here:

http://usa.autodesk.com/adsk/servlet/pc/item?siteID=123112&id=10775847

See #2686

Using vec3 <=> float conversions from @benaadams

For the moment just testing how it works (had to fix blending in WebGLRenderer for this). Seems with two RGBA float passes we could eventually get quite decent material range.

See discussion in https://github.com/mrdoob/three.js/commit/d951fcbcfa8efa8b7cecc10075e5e78be4027bac

This happens when you use MeshFaceMaterial for a single material model (that's what was going on in Lucy example).

Alternatively, we could set face.materialIndex by default to 0 instead of "undefined". This kinda makes sense, just would need to be checked if it wouldn't break things.