<feature> Update all the events using max notifications. Related to PR #191

Author: shakaran

Event/MessageListEvent.php

@@ -37,7 +37,7 @@ class MessageListEvent extends ThemeEvent
      *
      * @param null $max
      */
-    public function __construct($max)
+    public function __construct($max = NULL)
     {
         $this->max = $max;
     }

Event/NotificationListEvent.php

@@ -30,7 +30,7 @@ class NotificationListEvent extends ThemeEvent
      *
      * @param null $max
      */
-    public function __construct($max = null)
+    public function __construct($max = NULL)
     {
         $this->max = $max;
     }

Event/TaskListEvent.php

@@ -22,7 +22,7 @@ class TaskListEvent extends ThemeEvent
      *
      * @param $max
      */
-    public function __construct($max)
+    public function __construct($max = NULL)
     {
         $this->max = $max;
     }