def delete(key)
      log "deleting #{key} from #{container_path}"
      object_path = File.join(container_path, Raca::Util.url_encode(key))
      response = storage_client.delete(object_path)
      (200..299).cover?(response.code.to_i)
    end
def delete(key)
      log "deleting #{key} from #{container_path}"
      object_path = File.join(container_path, Raca::Util.url_encode(key))
      response = storage_client.delete(object_path)
      (200..299).cover?(response.code.to_i)
    end
Delete +key+ from the container. If the container is on the CDN, the object will
 still be served from the CDN until the TTL expires.