add closed tasks

- the entity has a new column / property "closed" (boolean)
- An event listener in created during container compilation, which listen on tasks
  status changed
- The taskworkflow manager and task workflow definition indicate if the tasks is closed ;
- Add list for closed tasks in controller, and change parameter 'date_status' to 'status';
- and change query to allow to filter on closed tasks

Workflow/TaskWorkflowManager.php

@@ -20,6 +20,7 @@ namespace Chill\TaskBundle\Workflow;
 use Chill\TaskBundle\Entity\AbstractTask;
 use Symfony\Component\Workflow\SupportStrategy\SupportStrategyInterface;
 use Symfony\Component\Workflow\Workflow;
+use Symfony\Component\Workflow\Event\Event;
 
 /**
  * 
@@ -80,4 +81,15 @@ class TaskWorkflowManager implements SupportStrategyInterface
         return $this->getTaskWorkflowDefinition($task)
             ->getWorkflowMetadata($key, $metadataSubject);
     }
+    
+    public function onTaskStateEntered(Event $e) 
+    {
+        $task = $e->getSubject();
+        
+        $definition = $this->getTaskWorkflowDefinition($task);
+        
+        $task->setClosed($definition->isClosed($task));
+        
+        dump($task);
+    }
 }