* Change references to tootsuite/mastodon to mastodon/mastodon
* Remove obsolete test fixture
* Replace occurrences of tootsuite/mastodon with mastodon/mastodon in CHANGELOG
And a few other places
* Add AUTHORS file with information taken from the git log. Authors are listed in order of appearance.
* Remove AUTHORS file with raw log information
* Add AUTHORS.md listing contributors with GitHub usernames and profile links
* Update AUTHORS.md