The source code is at https://github.com/hnakamur/d3.js-drag-bezier-curves-example/tree/use-kld-intersections
Changed Polynomial.ACCURACY from 6 to 15 at 2015-01-12T01:54-0900
https://github.com/thelonious/kld-intersections/issues/2#issuecomment-69484356