[w3c/webauthn] 440720: resized attstn structs figure, added fig to sectio...

  Branch: refs/heads/vgb-u2f-attestation
  Home:   https://github.com/w3c/webauthn
  Commit: 440720486a760ec69552f599bd9cd765ac3185b9
      https://github.com/w3c/webauthn/commit/440720486a760ec69552f599bd9cd765ac3185b9
  Author: JeffH <Jeff.Hodges@PayPal.com>
  Date:   2017-01-19 (Thu, 19 Jan 2017)

  Changed paths:
    M images/fido-attestation-structures.svg
    M index.bs

  Log Message:
  -----------
  resized attstn structs figure, added fig to section #cred-attestation