Update TV Source to find media files

Updated TV Source to iterate over media files and check each against the
cache to ignore previously seen items.

source/lib/DownloadDispatcher/Source/Plugin/RouterboardFirmware.class.php

@@ -1,6 +1,6 @@
 <?php
 
-class DownloadDispatcher_Source_Plugin_RouterboardFirmware extends DownloadDispatcher_PluginBase implements DownloadDispatcher_Source_IPlugin {
+class DownloadDispatcher_Source_Plugin_RouterboardFirmware extends DownloadDispatcher_Source_PluginBase implements DownloadDispatcher_Source_IPlugin {
     
     /**
      * Name of this plugin