[w3c/payment-request] Editorial: use internal slots (#726)

Finally, part 5 of #705  - closes #705 

Defines PaymentRequest's internal slots. 
In some cases, PaymentResponse just puts forward PaymentRequest's internal slot values.  

The following tasks have been completed:

 * [x] Confirmed there are no ReSpec errors/warnings.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-request/pull/726

-- Commit Summary --

  * WIP: retry() shell
  * define aborting and retrying
  * return promises rejected
  * complete() throws if retrying
  * Link to initial tests
  * Guard against calling request.abort() again
  * fix typo
  * Refactor pasta
  * Make it clear the UI is shutting down
  * remove redundant checks
  * Clarify closing, add asserts back in
  * Teach retry() about payerErrors
  * s/request/reponse typo
  * Remove redudant check
  * Refactored .retry()
  * Add shippingAddressErrors to PaymentValidationErrors
  * Make finally a step
  * tidy
  * Handle retry in abort the update algo
  * Define onpayerdetailchange event
  * fix typo
  * Editorial: use internal slots

-- File Changes --

    M index.html (622)

-- Patch Links --

https://github.com/w3c/payment-request/pull/726.patch
https://github.com/w3c/payment-request/pull/726.diff

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