- add http\Client::configure()
* options:
* bool(use_eventloop)
* bool(pipelining)
* int(maxconnects)
* int(max_total_connections)
* int(max_host_connections)
* int(max_pipeling_length)
* int(chunk_length_penalty_size)
* int(content_length_penalty_size)
* array(pipelining_site_bl)
* array(pipelining_server_bl)
- deprecate http\Client::enablePipelining()
- deprecate http\Client::enableEvents()