[w3c/webpayments] Include the IG terminology document (#149)

See https://github.com/w3c/webpayments/issues/135. This change does cause some duplicate definition errors, which should go away when https://github.com/w3c/webpayments-ig/pull/43 is merged.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/webpayments/pull/149

-- Commit Summary --

  * Include the IG terminology document
  * Add utils.js

-- File Changes --

    M proposals/paymentapps/payment-apps.html (61)
    A proposals/paymentapps/utils.js (117)

-- Patch Links --

https://github.com/w3c/webpayments/pull/149.patch
https://github.com/w3c/webpayments/pull/149.diff

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https://github.com/w3c/webpayments/pull/149