Added ThirdParty Presentation

As given to California IOU Third Parties (+ august update)
Checkpoint Update (upon return to Idaho)

General checkpoint of documents with the addition of the
api_specification.md
faq.md

Started the real faq.md - this faq, along with fed-faq and dev-faq, are
the current FAQ set for Green Button
espi and documents archives

(Also added a general information architecture to the mm that describes
this web-site)
corrected greenGov document link.
removed spurious "XF"