Re: [touch-events] Add support for uncancelable touch events (#59)

@smaug--- @dtapuska thoughts?  This is a little hand-wavy, so I appreciate any suggestions for making the language more precise.  But since this is all tied up in performance optimizations (whose details depend on the compositing / threaded input and hit-testing architecture of the user agent), we can't define exactly when a touch event will be cancelable.

Still I hope this is at least better than the long period where we've pretended that touch events can always be canceled.  Sorry it's taken me so long to fix issue #6. 

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