code: def subscribe(self, feedUrl):
          
          response = self.httpPost(
              ReaderUrl.SUBSCRIPTION_EDIT_URL,
              {'ac':'subscribe', 's': feedUrl})
          # FIXME - need better return API
          if response and 'OK' in response:
              return True
          else:
              return False
docs: Adds a feed to the top-level subscription list
  
          Ubscribing seems idempotent, you can subscribe multiple times
          without error
  
          returns True or throws HTTPError