1. According to the spec, either we have a single challenge with
a number of `signRequests`, or a number of `signRequests`, each with
it's own challenge.
2. Previously, we had both these - per-request challenges, as well as a
single extra challenge.
3. This commit changes this so that the per-request challenges are
removed, leaving only a single challenge, as per the v1.1 U2F API.
4. The existing implementation didn't work in Firefox, because the
Firefox (extension) implementation is less flexible with regard to
the inputs.
5. Fix teaspoon specs.
6. References: https://fidoalliance.org/specs/fido-u2f-v1.0-nfc-bt-amendment-20150514/fido-u2f-javascript-api.html#h2_background
1. Only on supported Chrome versions
2. Mainly, this lets us simplify the javascript-based U2F check to
`window.u2f`, where `window.u2f` can either be loaded from the GitLab
server (for Chrome) or from the Firefox extension.
3. This is a better way to provide browser detection for U2F.
Timothy Andrew