Re: [touch-events] Length of changedTouches list during a touchstart event (#34)

In chromium I believe we'll never put two new touches in the same `touchstart` (or `touchend` event) but this is really just due to the API design of the underlying platforms we run on (where each finger comes as a separate event) and our desire not to buffer start/end events at all.  So I see no reason to require separate events (I could imagine doing a small performance optimization to merge these).

On iOS however, the underlying API design matches the model of touch events, and sure enough there I can see multiple `changedTouches` in a single `touchstart` or `touchend` event.  [Here's a test page](http://jsbin.com/jikalu).

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