Version 1.6.0

Added Full-Duplex socket binding support.
Added poolTimeout for SocketClient.
Added maxPoolSize property for SocketClient.
Added onBeforeInvoke, onAfterInvoke, onSendError, onSendHeader properties for Service.
Rewrite the Hprose Future to be compatible with Promises/A+.
Added trunc method for BytesIO.
Removed hprose.Exception.
Added returning Serialized data in batch mode support.
Improved WebSocket Service.
Improved WebSocket Client.