Add MediaFilesIterator

Add a simple utility class that can be used to find media files (video
and archives) from a directory tree.

source/lib/DownloadDispatcher/Utility/MediaFilesIterator.class.php

@@ -0,0 +1,9 @@
+<?php                                                                                                                                                                             
+                                                                                                                                                                                  
+class DownloadDispatcher_Utility_MediaFilesIterator extends FilterIterator {                                                                                                            
+    public function accept() {                                                                                                                                                    
+        return preg_match('/(?<!\.sample)\.(?:avi|ogm|m4v|mkv|mov|mp4|mpg|srt|rar)$/i', $this->current()->getFilename());                                                                          
+    }                                                                                                                                                                             
+}                                                                                                                                                                                 
+                                                                                                                                                                                  
+?>