Version 1.5.5

Added setOption and removeOption method for HttpClient.
More safe autoload.
Fixed curl client endless loop when server response 100.
Added http client example.
Added batch support for jsonrpc service.
Improved swoole socket client.
Removed unnecessary php files.
Added lowercase classname support.
Fixed a bug of HproseSwooleWebSocketService.
Added mode parameter for WebSocket and Http Server.
Added chat example.
Fixed send data > 2M.
Added async connection pool.