Changes

* 2016 Q2: FIDO U2F v1.1 JS API landed, hidden behind preferences.

** You can test a "Soft Token" using any recent version of Firefox using the instructions at https://u2f.bin.coffee/

* 2016 Q4: Draft WebAuthn JS API available, hidden behind a pref, using the Soft Token from U2F.

** [https://groups.google.com/d/msg/mozilla.dev.platform/F0rCRF8z87E/CPh7dIJ9BQAJ Intent to Implement Announcement]

* 2017 Q1: Support USB HID U2F devices on Windows / Mac OS X.

* 2017 Q1-2: Update to the final implementation WebAuthn JS API.

* 2017 (sometime): Support USB HID CTAP devices on desktop platforms. (Exact version TBD)

* 2017 (sometime): Support WebAuthn for mobile Firefox.