Re: [touch-events] Spec should be explicit on whether the of elements in TouchLists is relevant (#13)

It looks like hammer.js [has this issue](https://github.com/hammerjs/hammer.js/issues/791) in their rotation gesture recognizer (rotation will flip 180 degrees if the two touch points swap position in the touches list).  Even if they fix this, we know tons of sites use hammer.js (though I'm not sure how common rotation gesture recognition is).

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