- WebGLMultipleRenderers: Use Geometry instead of BufferGeometry
- index.html: add "webgl_multiple_renderers" again
- Misc. fixes to please closure compiler (unused var).

Store reading and writing to `.offsets`.

Avoid mutations to `.drawcalls` from outside the `BufferGeometry`.

renamed webglproperties method names. Now correctly accounts for interleaved attributes sharing buffers

Added class WebGLProperties, webgl properties now stored in that class. Checks for uuids and existance of properties encapsulated in this class

webgl props are removed in one go in object deallocation, added better example, removed other examples, added check for properties at entrance of each function that uses properties

WebGLRenderer/WebGLProgram: Added SHADER_NAME define. See https://gist.github.com/spite/7ae92212b4f28076ba29.

decoupled webgl properties and buffers from renderable objects and attributes. Scenes and objects no longer coupled to renderers and may be used between multiple renderers.