Version 2.0.0

Full compatible with Promises/A+.
Added middleware support.
Added push support.
Added oneway call support.
Added idempotent calls automatically fail retry support.
Added (pseudo) synchronous call support.
Added load balancing, and fail switch support.
Improved the client API.
Improved the batch invoke.
Added binary data support.
Added WebSocketClient.
Added TcpClient.
Added asynchronous loader (RequireJS and SeaJS) support.
Added CommonJS support.
HttpClient compatible with ionic, cocos2d-js, DCloud, APICloud etc.
TcpClient compatible with chrome extension and ionic app on android & iOS.
Improved Harmony Map. Key equality for -0 and 0.