def clear(url)
      if code_obj = code_object(url)
        @url_bucket.delete  code_obj.key
        @code_bucket.delete code_obj.data
      end
    end
def clear(url)
      if code_obj = code_object(url)
        @url_bucket.delete  code_obj.key
        @code_bucket.delete code_obj.data
      end
    end
Public: Removes the assigned short code for a URL.

 url - The String URL to remove.

 Returns nothing.