[w3c/touch-events] Add Safari iOS 10.3 extensions for stylus (#81)

Apparently Safari on iOS 10.3 now exposes the [stylus properties from iOS](https://developer.apple.com/reference/uikit/uitouch). These seem reasonable to me (map closely to PointerEvents tiltX, tiltY and pointerType) and could help enable more complete Pointer Events polyfills.  I think we should add them to the spec to document what an important implementation has shipped.

See [here](https://rawgit.com/RByers/touch-events/safari-stylus/index.html#touch-interface) for the output.

@grorg does this look good and match what you've shipped in Safari?
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/touch-events/pull/81

-- Commit Summary --

  * Add Safari iOS 10.3 extensions for stylus
  * Fix typos

-- File Changes --

    M index.html (50)

-- Patch Links --

https://github.com/w3c/touch-events/pull/81.patch
https://github.com/w3c/touch-events/pull/81.diff

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