Change exception classes to include stanza error. Change name of exception base class to Error. Change backend error map to have a tuple as value: stanza-error, pubsub-error. Remove empty componentConnected() definition in Service. Move registering of notification from __init__ to componentConnected in ComponentServiceFromNotificationService. Add observers for subscribe, options and configure.

register("Idavoll", "idavoll.tap",
         description="Jabber Publish Subscribe Component",
         type='tap', tapname='idavoll')