'Request the latest version of feed.
Args:
init (bool, optional): If this is an initialization call
or not (during init, all entries are conidered new).
Notes:
This call is done in a separate thread to avoid blocking
on slow connections.'

def update(self, init=False):

    return threads.deferToThread(self.get_new).addCallback(self._callback, init).addErrback(self._errback)
