Public Domain OpenScad Bezier Function

After playing around with fillets on this thing: http://www.thingiverse.com/thing:8416 I was determined to create a generalized Bezier function for usage in OpenScad.

This thing, or rather the OpenScad file, is public domain code for creating Bezier curves within OpenScad.

It is a foundational piece. It will only create Bezier curves defined by 4 control points. Those are typically the most useful in hand constructed graphics as found in OpenScad.

Hopefully this little piece of goodn