[w3c/webauthn] 33cdaf: Fix issue with |savedCredentialId| scope

  Branch: refs/heads/issue-613-hot-plugging-finish
  Home:   https://github.com/w3c/webauthn
  Commit: 33cdaf1da2f0384266cc852f8fe8c3db49be7722
      https://github.com/w3c/webauthn/commit/33cdaf1da2f0384266cc852f8fe8c3db49be7722
  Author: Emil Lundberg <emil@yubico.com>
  Date:   2018-05-09 (Wed, 09 May 2018)

  Changed paths:
    M index.bs

  Log Message:
  -----------
  Fix issue with |savedCredentialId| scope

This fixes one of the inline issues in the spec.

Since the value of the |savedCredentialId| variable depends on the
credentials contained in each |authenticator|, a single global
|savedCredentialId| variable is not sufficient. Therefore a map of
|authenticator|s to |savedCredentialId|s is used instead.


  Commit: e124cd769b561a8938fbed8e9964b3d0e20a2d7e
      https://github.com/w3c/webauthn/commit/e124cd769b561a8938fbed8e9964b3d0e20a2d7e
  Author: Emil Lundberg <emil@yubico.com>
  Date:   2018-05-09 (Wed, 09 May 2018)

  Changed paths:
    M index.bs

  Log Message:
  -----------
  Reformulate "lifetime of |lifetimeTimer|" as "until |lifetimeTimer| expires"


  Commit: 56fd4467d5ff256fb391423bb35740dbce041853
      https://github.com/w3c/webauthn/commit/56fd4467d5ff256fb391423bb35740dbce041853
  Author: Emil Lundberg <emil@yubico.com>
  Date:   2018-05-09 (Wed, 09 May 2018)

  Changed paths:
    M index.bs

  Log Message:
  -----------
  Merge "for each authenticator" algorithm step into "while timer not expired" step

This merges the previous step 19 of makeCredential in as a switch case
of step 20, and the previous step 18 of getAssertion in as a switch case
of step 19. This way there is only one step in each algorithm that tries
to express things to do asynchronously for the duration of the timer.

The inline `Issue:`s mentioning underspecified behaviour are replaced
with descriptions of an abstract "set of presently available
authenticators" and `Note:`s indicating that this is intentionally
underspecified and meant to represent different connection and discovery
mechanisms all in one.

This also swaps the order of the previous steps 17 ("Start
|lifetimeTimer|.") and 18 ("Let |issuedRequests| be a new ordered set")
of makeCredential, for consistency with getAssertion and so that the
step "Start |lifetimeTimer|." immediately precedes the step "While
|lifetimeTimer| has not expired [...]".


Compare: https://github.com/w3c/webauthn/compare/33cdaf1da2f0^...56fd4467d5ff
      **NOTE:** This service been marked for deprecation: https://developer.github.com/changes/2018-04-25-github-services-deprecation/

      Functionality will be removed from GitHub.com on January 31st, 2019.