[paymentrequest] Update API document with missing details (#38)

This pull request fills in some of the gaps created in the previous API refactoring change, fixes some bugs, and tidies up the document.
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-- Commit Summary --

  * Tidying up SVG diagram
  * Added detail to algorithms and fixed shipping option bugs.
  * Updated document front matter.
  * Fixed typos and updated to US English spelling.

-- File Changes --

    M specs/paymentrequest.html (254)
    M specs/state-transitions.svg (80)

-- Patch Links --


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Received on Tuesday, 15 December 2015 00:40:14 UTC