Adding missing import. Fixes #1736

lib/Cake/Console/Command/AclShell.php

@@ -16,6 +16,7 @@
  * @since         CakePHP(tm) v 1.2.0.5012
  * @license       MIT License (http://www.opensource.org/licenses/mit-license.php)
  */
+App::uses('ComponentCollection', 'Controller');
 App::uses('AclComponent', 'Controller/Component');
 App::uses('DbAcl', 'Model');