Tie Kolab_Storage to Horde_History if enabled

Otherwise Kolab_Storage_Factory::createHistory()
will use the in-memory only Horde_History_Mock object.

framework/Core/lib/Horde/Core/Factory/KolabStorage.php

@@ -110,6 +110,13 @@ public function create()
             'cache' => $this->_injector->getInstance('Horde_Cache'),
         );
 
+        // Check if the history system is enabled
+        try {
+            $history = $this->_injector->getInstance('Horde_History');
+            $params['history'] = $history;
+        } catch(Horde_Exception $e) {
+        }
+
         $factory = new Horde_Kolab_Storage_Factory($params);
         return $factory->create();
     }