move geshi to library/

library/Fiktiv/Highlighter/Geshi.php

@@ -1,14 +1,13 @@
 <?php
 
+require_once 'geshi/geshi.php';
+
 class Fiktiv_Highlighter_Geshi extends Fiktiv_Highlighter_Abstract
 {
     protected $_geshi = null;
 
     public function __construct()
     {
-        // Load the GeSHi library
-        require_once APPLICATION_EXTERNAL . '/geshi/geshi.php';
-
         $this->_geshi = new GeSHi();
     }