Bug 1049916 - Create Firefox Accounts smoke tests to validate user authe...

...ntication R=spenrose
ditto here, maybe we can be more explicit about the API version? Since the doc can be edited without updating the `/v1` in the URL, I'd say the best plan is to include the git SHA for the latest commit against that api.md document. If we take that approach, then it'll be easy to do a `git diff` against future versions of that document, to determine what (if anything) has gone stale between mock and server.