CRM-12624

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* CRM-12624: WordPress does not allow anon user to access subscribe/unsubscribe CiviMail pages
  http://issues.civicrm.org/jira/browse/CRM-12624

CRM/Core/Permission/WordPress.php

@@ -56,8 +56,7 @@ class CRM_Core_Permission_WordPress extends CRM_Core_Permission_Base {
     }
 
     // Make string lowercase and convert spaces into underscore
-    $str = strtolower($str);
-    $str = str_replace(" ","_",$str);
+    $str = CRM_Utils_String::munge(strtolower($str));
 
     if ( is_user_logged_in() ) {
       // Check whether the logged in user has the capabilitity