[w3c/webauthn] c42a82: Make hashAlg a "recognized algorithm name". (#352)

  Branch: refs/heads/master
  Home:   https://github.com/w3c/webauthn
  Commit: c42a822a357c1697c999d930106ed666f78261c5
      https://github.com/w3c/webauthn/commit/c42a822a357c1697c999d930106ed666f78261c5
  Author: Jeffrey Yasskin <jyasskin@gmail.com>
  Date:   2017-03-01 (Wed, 01 Mar 2017)

  Changed paths:
    M index.bs

  Log Message:
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  Make hashAlg a "recognized algorithm name". (#352)

* Make `hashAlg` a recognized algorithm name for a digest algorithm.

This drops the use of "S256", etc.

* Remove the IANA section for S256, etc.

This didn't really fit anyway since SHA-256, etc are digests not "Cryptographic
Algorithms for Digital Signatures and MACs".