current username checked && refactor && remove players in channel when they are more than 2

src/Mine/SeekerBundle/Resources/views/Game/play.html.twig

@@ -10,7 +10,8 @@
 {% block body %}
     <div id="mine-wrapper"
          data-env="{{ env }}"
-         data-game-id="{{ app.request.get('gameAssoc') }}">
+         data-game-id="{{ app.request.get('gameAssoc') }}"
+         data-user-name="{{ app.user.username }}">
     </div>
 {% endblock %}