text: Title: No rename method on GoogleCloudStorage
  Body: I'm using the following to allow renaming:
  
  ```
  @deconstruct.deconstructible
  class GoogleCloudStorage(gcloud.GoogleCloudStorage):
      def path(self, name) -> typing.AnyStr:
          raise NotImplementedError()
  
      def get_accessed_time(self, name) -> datetime.datetime:
          raise NotImplementedError()
  
      def rename(self, old_name: str, new_name: str) -> None:
          blob = self.bucket.blob(old_name)
          self.bucket.rename_blob(blob, new_name)
  ```
  
  Requesting feature.