support using a different container classes, through

klass = StorageFolder, or other class...

[git-p4: depot-paths = "//depot/": change = 738]

ContentDirectory.py

@@ -37,8 +37,8 @@ class ContentDirectoryControl(UPnPPublisher, dict):
 	self.nextID += 1
 	return ret
 
-    def addContainer(self, parent, title, **kwargs):
-	ret = self.addItem(parent, Container, title, **kwargs)
+    def addContainer(self, parent, title, klass = Container, **kwargs):
+	ret = self.addItem(parent, klass, title, **kwargs)
 	self.children[ret] = []
 	return ret