reverting "use XMPPHP/ folder instead of dirname(__FILE__) which is inefficient"

method whis relative path not work for lib - random current dir
dirname faster and not need change include_path

more info on
http://stackoverflow.com/questions/2220443/whats-better-of-requiredirname-file-myparent-php-than-just-require

XMPPHP/XMLStream.php

@@ -27,13 +27,13 @@
  */
 
 /** XMPPHP_Exception */
-require_once 'XMPPHP/Exception.php';
+require_once dirname(__FILE__) . '/Exception.php';
 
 /** XMPPHP_XMLObj */
-require_once 'XMPPHP/XMLObj.php';
+require_once dirname(__FILE__) . '/XMLObj.php';
 
 /** XMPPHP_Log */
-require_once 'XMPPHP/Log.php';
+require_once dirname(__FILE__) . '/Log.php';
 
 /**
  * XMPPHP XML Stream