[webauthn] new commits pushed by vijaybh

The following commits were just pushed by vijaybh to 
https://github.com/w3c/webauthn:

* refine user verification and authz gesture definitions, add Test of 
User Presence (#365)

* refine user verif and authz gesture, fixes #357, improves #358

* further polish #357

* fix build: add comma to refs

* improve ceremony dfn, add Angelo to ACKs

* refine user verification dfn

* fix build by adding the proverbial missing comma...

* polish 'user consent' dfn per jcjones comment
  by =JeffH
https://github.com/w3c/webauthn/commit/7ccb88203be7b7d521d9fe000ceb4e61cf980a0c

* Merge branch 'master' into vgb-refine-makecredential
  by Vijay Bharadwaj
https://github.com/w3c/webauthn/commit/7cc32e6acab813d02e38833fb506a2e8862f2e4c