Re: Answers to questions in new points.js polyfill

Rick - many thanks for reaching out and for the clarifications. I've
updated the readme with your responses. Great to learn that we can look
forward to experimental support in Chrome soon.

Daniel - it would be great to work towards a single polyfill, and it makes
sense for that work to happen under the Polymer/Toolkitchen banner. Let me
know what I can do to help.

You're right about the tradeoff being less than ideal. Ultimately I settled
on that approach because I wanted something reasonably future-proof, and I
find pointer(over|out|enter|leave) as defined by the PE spec more useful
than what you get from proxying touch events - the performance penalty
being the price you pay for using a browser that doesn't support PE. But
your counter-argument is persuasive. I don't think there's a way to get the
same effect without window-level touch handlers, but I'd love to be proved
wrong!