Display how many messages are queue

- update the docker-composer to add Redis
- add migrations

src/Wallabag/CoreBundle/Resources/views/themes/material/layout.html.twig

@@ -19,6 +19,8 @@
             Materialize.toast('{{ flashMessage|trans }}', 4000);
         </script>
     {% endfor %}
+
+    {{ render(controller("WallabagImportBundle:Import:checkQueue")) }}
 {% endblock %}
 
 {% block menu %}