Add: #95 リストへの新着投稿通知 (#192)

* Add: テーブル定義、内部処理

* Add: 通知の定期削除処理、自動削除、テスト

* Add: Web画面の表示、設定

* Fix test

app/javascript/mastodon/reducers/notifications.js

@@ -55,6 +55,7 @@ const notificationToMap = notification => ImmutableMap({
   created_at: notification.created_at,
   emoji_reaction: ImmutableMap(notification.emoji_reaction),
   status: notification.status ? notification.status.id : null,
+  list: notification.list ? ImmutableMap(notification.list) : null,
   report: notification.report ? fromJS(notification.report) : null,
   account_warning: notification.account_warning ? ImmutableMap(notification.account_warning) : null,
 });