mastodon/spec/javascript/components
Eugen 12f72e1740 When avatar/header are GIF, generate static versions ()
* When avatar/header are GIF, generate static versions.
Account API returns "avatar"/"avatar_static", "header"/"header_static"
Static version is the same as original for other cases
Web UI de-animates avatars in toots, lists of users

Fix , fix , prerequisite for 

* Fix JS test

* Add rake task to generate static avatars/headers from GIF ones, add test
..
avatar.test.jsx When avatar/header are GIF, generate static versions ()
button.test.jsx add/update specs for Button, DisplayName, DropdownMenu
display_name.test.jsx add/update specs for Button, DisplayName, DropdownMenu
dropdown_menu.test.jsx add/update specs for Button, DisplayName, DropdownMenu
loading_indicator.test.jsx Remove broken test