docs: def get_speakers(self, collection_name):
          """Get a list of speaker URLs for this collection
  
          :type collection_name: String
          :param collection_name: the name of the collection to search
  
          :rtype: List
          :returns: a list of URLs for the speakers associated with
              the given collection
  
          """
  
          speakers_url = "/speakers/"+collection_name
          resp = self.api_request(speakers_url)
          if 'speakers' in resp:
              return resp['speakers']
          else:
              return []