Merge remote-tracking branch 'origin/master' into gs-master

Conflicts:
 	app/javascript/styles/mastodon/components.scss
 	app/models/media_attachment.rb

spec/models/concerns/remotable_spec.rb

@@ -29,7 +29,10 @@ RSpec.describe Remotable do
 
   context 'Remotable module is included' do
     before do
-      class Foo; include Remotable; end
+      class Foo
+        include Remotable
+        remotable_attachment :hoge, 1.kilobyte
+      end
     end
 
     let(:attribute_name) { "#{hoge}_remote_url".to_sym }