[paymentrequest] Spec correctness updates based on review feedback (#47)

@travisleithead reviewed the spec against the API design guidelines and for correctness and gave me a list of feedback to use correct specification structure and language. Some of the language in the spec was already either handled in WebIDL (e.g. structured clone of dictionary is implied) or better reflected with WebIDL (e.g. using default values in dictionaries). Internal data is now described using internal slots.
You can view, comment on, or merge this pull request online at:

  https://github.com/WICG/paymentrequest/pull/47

-- Commit Summary --

  * Fix some WebIDL and spec nits from review feedback
  * Merge remote-tracking branch 'WICG/gh-pages' into gh-pages
  * Update internal data to use "internal slot" syntax.

-- File Changes --

    M specs/paymentrequest.html (213)

-- Patch Links --

https://github.com/WICG/paymentrequest/pull/47.patch
https://github.com/WICG/paymentrequest/pull/47.diff

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https://github.com/WICG/paymentrequest/pull/47