Re: [touch-events] TouchInit should perhaps include pageX and pageY (#28)

Thanks @annevk, that makes sense.  I'm also not sure what to do about `MouseEventInit` but since `TouchInit` is new, let's do the right thing and include the computed properties `pageX` and `pageY` (even though that may be inconsistent with `MouseEventInit`).

@choniong feel free to submit a pull request with that spec tweak (or if you prefer I can make it).

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