Make it clear on the gh-page that this library does not draw anything, and that drawing code is your responsibility

[Pomax]

People see this:

new Bezier(150,40 , 80,30 , 105,150);
var draw = function() {
  this.drawSkeleton(curve);
  this.drawCurve(curve);
}

and think that somehow those draw functions come with bezier.js

That needs to be remedied.