[w3c/webauthn] f3fa6b: Incorporated feedback from @rlin1

  Branch: refs/heads/vgb-modular-attestation
  Home:   https://github.com/w3c/webauthn
  Commit: f3fa6b3e5ca255198966920a4231f18ac4b42fe4
      https://github.com/w3c/webauthn/commit/f3fa6b3e5ca255198966920a4231f18ac4b42fe4
  Author: Vijay Bharadwaj <vijaybh@users.noreply.github.com>
  Date:   2016-09-16 (Fri, 16 Sep 2016)

  Changed paths:
    M index.bs

  Log Message:
  -----------
  Incorporated feedback from @rlin1

Also cleaned up wording and naming for consistency.

Added Android N attestation format. Fixes #103.

Changed name for SafetyNet attestation format. Fixes #128.


  Commit: f920f871852689d00f819fb4a3ccabcd00dc112f
      https://github.com/w3c/webauthn/commit/f920f871852689d00f819fb4a3ccabcd00dc112f
  Author: Vijay Bharadwaj <vijaybh@users.noreply.github.com>
  Date:   2016-09-16 (Fri, 16 Sep 2016)

  Changed paths:
    M index.bs

  Log Message:
  -----------
  Clarify that attestation is not optional

Fixes #86

Also clarify that at least self attestation must be used. Fixes #115


Compare: https://github.com/w3c/webauthn/compare/fa8aab28f435...f920f8718526