[w3c/webauthn] c05d78: Clean up extensions section

  Branch: refs/heads/vgb-extension-opt
  Home:   https://github.com/w3c/webauthn
  Commit: c05d78629156b9b99faedcd03151cc8cefa7ce91
      https://github.com/w3c/webauthn/commit/c05d78629156b9b99faedcd03151cc8cefa7ce91
  Author: Vijay Bharadwaj <vijaybh@users.noreply.github.com>
  Date:   2016-06-15 (Wed, 15 Jun 2016)

  Changed paths:
    M index.src.html

  Log Message:
  -----------
  Clean up extensions section

- Resolve inconsistent wording in different parts of the section: fix
places that incorrectly suggested extensions cannot be used with
makeCredential, and resolve conflict between wording that said client
arguments are required vs. not.
- Treat implementations that choose to pass through extensions as a
first-class citizen by requiring that extensions be defined to allow for
this. Fixes #97.
- Fix all the predefined extensions to conform to the updated
guidelines.
- Minor issues: AAGUID should be binary not string (see #61, fixes #51)
and encode true as Boolean in CBOR instead of forcing it to integer
value 1.