Add Sync plugins

Add support for synchronising remote content before running the source
dispatchers. First plugin adds Rsync support.

source/lib/DownloadDispatcher/Sync/PluginFactory.class.php

@@ -0,0 +1,30 @@
+<?php
+
+class DownloadDispatcher_Sync_PluginFactory extends DownloadDispatcher_PluginFactory {
+    
+    protected static $plugin_prefix    = 'DownloadDispatcher_Sync_Plugin_';
+    protected static $plugin_interface = 'DownloadDispatcher_Sync_IPlugin';
+    protected static $plugin_dir       = array(
+    	DownloadDispatcher_Lib  => 'DownloadDispatcher/Sync/Plugin/',
+	);
+    
+    
+    public static function init() {
+        
+    }
+    
+    public static function create($plugin, SihnonFramework_Config $config, SihnonFramework_Log $log, $instance) {
+        self::ensureScanned();
+    
+        if (! self::isValidPlugin($plugin)) {
+            throw new Sihnon_Exception_InvalidPluginName($plugin);
+        }
+    
+        $classname = self::classname($plugin);
+    
+        return call_user_func(array($classname, 'create'), $config, $log, $instance);
+    }
+    
+}
+
+?>