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

Controller/TaskController.php

@@ -71,10 +71,10 @@ class TaskController extends Controller
             
             $em->flush();
             
-            $this->addFlash('success', 'The transition is sucessfully applyed');
+            $this->addFlash('success', 'The transition is sucessfully appliyed');
 
         } else {
-            $this->addFlash('error', 'The transition could not be applyed');
+            $this->addFlash('error', 'The transition could not be appliyed');
         }
         
         return $this->redirect($request->query->get('return_path', $defaultReturnPath));