Hopefully no more deprecation warnings.

This was relic from before "console.log" was working cross-browser.

Cleaned up some more examples.

Problem was that objects could be added to WebGLRenderer's internal render list only once (because of `webglInit` flag).

Now there are two separate internal states (`webglInit` and `webglActive`) so that object can be initialized just once (expensive operation) but added / removed from the scene many times (cheap operation).

Modifying FirstPersonCamera, FlyCamera, and PathCamera to fully support their `domElement` parameter

Also removed unused material Sprite parameter.