[w3c/webauthn] f864d0: Fix #593: employ PRECIS RFC8264 et al for 'name'-i...

  Branch: refs/heads/master
  Home:   https://github.com/w3c/webauthn
  Commit: f864d09715352ba30390664aa42518f4defbdce3
      https://github.com/w3c/webauthn/commit/f864d09715352ba30390664aa42518f4defbdce3
  Author: =JeffH <mobileuser@kingsmountain.com>
  Date:   2018-07-12 (Thu, 12 Jul 2018)

  Changed paths:
    M index.bs

  Log Message:
  -----------
  Fix #593: employ PRECIS RFC8264 et al for 'name'-ish domstring values (#951)

given https://github.com/w3c/webauthn/pull/951#issuecomment-404278183 where we decided on the 11-Jul webauthn call to go ahead and merge this PR as-is, and @stpeter's nominal ok of the presentation warning https://github.com/w3c/webauthn/pull/951#issuecomment-404297635, I'm merging this.  if anyone feels there are problems with it, please submit specific new issues.

* employ PRECIS RFC8264 et al for 'name'-ish domstring values

* address emlun's review comment

* remove reference to 'preparation', 'enforcement' includes it

* re-do section references per selfissued

* client-side normativity to SHOULD

* add presentation admonition wrt name-ish strings



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