[w3c/webauthn] b69562: add registry refs and update associated text (#192...

  Branch: refs/heads/master
  Home:   https://github.com/w3c/webauthn
  Commit: b695628aeca3834a4dfa1348a72fce2190503ccc
      https://github.com/w3c/webauthn/commit/b695628aeca3834a4dfa1348a72fce2190503ccc
  Author: =JeffH <Jeff.Hodges@KingsMountain.com>
  Date:   2016-09-07 (Wed, 07 Sep 2016)

  Changed paths:
    M index.bs

  Log Message:
  -----------
  add registry refs and update associated text (#192)

* ref IANA registries initial cut.  fixes #127, #129, #155.

* remove 'Level:' from metadata - fix build?

* fix build: was missing portions of biblio entry, restore 'Level:'

* restate attstn format idents and adjust section titles

* editorial fixups for #155 et al