Add the server attribute

Author: shengyuan

src/board/Bit.js

@@ -52,6 +52,7 @@
   });
 
   Bit.DEFAULT_SERVER = 'wss://ws.webduino.io:443';
+  Bit.SERVER_CHINA = 'wss://ws.webduino.com.cn';
 
   proto.startup = function () {
     this._isReady = true;

src/board/Smart.js

@@ -50,6 +50,7 @@
   });
 
   Smart.DEFAULT_SERVER = 'wss://ws.webduino.io:443';
+  Smart.SERVER_CHINA = 'wss://ws.webduino.com.cn';
 
   scope.board.Smart = Smart;
 }));