Clearbit Funnel Demo
This supports an infinite number of conversion steps and infinite number of conversion sources -- in theory. Stylistically it is only semi-responsive. It is bound on a viewport that is always 1000 high, and is the width you set in index.js in Funnel.prototype.dimensions so there's some work to be done there.
createBeizerSVGPath Method
This is the meat of making the curves on the chart (rather than geometric jagged lines), but it's a bit convoluted at this point. Will refactor. I used this site below to help me figure out the geometry to make nice curves dynamically, but I also tuned it by eye, hence all the static numbers.
http://blogs.sitepointstatic.com/examples/tech/svg-curves/cubic-curve.html
Well known possible errors
If you have a non-matching number of data sources in each step, you will have a bad time. If they are out of order, you will have a bad time. I haven't bullet proofed it; it's probably worth doing checks on that to throw errors.
Demo Image
