Add circle posts history support (#18)

* Wip: make web backend

* Wip: keep statuses if edit circle

* Wip: Add circle history page and record circle posts

* Add circle post to history in web ui when post

* Add test

config/routes/api.rb

@@ -226,6 +226,7 @@ namespace :api, format: false do
 
     resources :circles, only: [:index, :create, :show, :update, :destroy] do
       resource :accounts, only: [:show, :create, :destroy], controller: 'circles/accounts'
+      resource :statuses, only: [:show], controller: 'circles/statuses'
     end
 
     resources :bookmark_categories, only: [:index, :create, :show, :update, :destroy] do