Ahmed

Results 4 issues of Ahmed

To be added with https://github.com/keratin/authn-server/pull/265

Adds the ability to get an account by username, alongside the normal id. As discussed in #264

Is it possible to get an account using the username only, rather than the id?

This will implement #1846. I also have a [project](https://github.com/ahme-dev/htswap) that acts on popstate events for browser back/forward actions, and its tests fail as something like `window.history.back()` doesn't trigger an event.