For those that don't trust jsperf :P

I bet there is a "righter" way. But that's how it's working for me.

This reverts commit 5be78ec3.

remove double entry

Detect Python version when running build.py script and let user know the script won't run in Python < 2.7, suggest a download link, then quit

fix three missed conversions to closures.  switch to extending math prototypes rather than replacing them.  This is to ensure that types created in closures within a type's prototype definition get their prototype updated with the full definition.

Renamed Vector3 projectPoint() to applyProjection() as per @WestLangley suggestion in bb873d16.

Changed back some .projectPoint() to .applyMatrix4() as per bb873d16.