Refactor: Inbox store, remove inboxes from sidebar (#387)

* Refactor: Inbox store, remove inboxes from sidebar

* Add a new page for inbox settings

* Show inboxes on sidebar

* Add inbox_members API

* Disable similar-code check

* Fix codeclimate scss issues

* Add widget_color update API and actions

* Add specs for inbox store

* Fix Facebook auth flow

* Fix agent loading, inbox name

app/javascript/dashboard/api/ApiClient.js

@@ -4,7 +4,8 @@ const API_VERSION = `/api/v1`;
 
 class ApiClient {
   constructor(url) {
-    this.url = `${API_VERSION}/${url}`;
+    this.apiVersion = API_VERSION;
+    this.url = `${this.apiVersion}/${url}`;
   }
 
   get() {