Add missing $this return on a method

git-svn-id: http://framework.zend.com/svn/framework/standard/trunk@20520 44c647ce-9c0f-0410-b52a-842ac1e357ba

library/Zend/Cache/Manager.php

@@ -185,6 +185,7 @@ class Zend_Cache_Manager
                 . ' an associative array or instance of Zend_Config');
         }
         $this->_optionTemplates[$name] = $options;
+        return $this;
     }
 
     /**