[w3c/webpayments-payment-apps-api] Simplify Example 3 as per issue #82 (#101)

This change removes all of the HTTP Post functionality from Example 3,
since this appears to cause more confusion than clarification. There are
also some issues with this code:

  https://github.com/w3c/webpayments-payment-apps-api/issues/82#issuecomment-275976677

The remaining code is updated to use promises correctly, to unregister
from the 'message' event correctly, and to make correct use of the
basic-card specification.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/webpayments-payment-apps-api/pull/101

-- Commit Summary --

  * Simplify Example 3 as per issue #82

-- File Changes --

    M index.html (91)

-- Patch Links --

https://github.com/w3c/webpayments-payment-apps-api/pull/101.patch
https://github.com/w3c/webpayments-payment-apps-api/pull/101.diff

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https://github.com/w3c/webpayments-payment-apps-api/pull/101