Re: [touch-events] createTouch has all the params as required, should probably have them optional (#58)

The spec assumes this magical conversion as well (or at least fails to define how one can initialize clientX/Y using this API).  But I agree the spec doesn't quite fully define what should happen here (though it's somewhat implicit from the definitions of clientX/clientY and pageX/pageY).

My feeling is that since these APIs are now deprecated, it's not worth trying to fix anything here (we should instead just focus on the constructors).  But I'm willing to add something to the spec for this if you think it's valuable.  WDYT?

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