fixing proper binding of post processor

fixing issue on "this" properly passed into parseX-methods processing response messages depending on message type

Author: soletan

lib/connection.js

@@ -314,7 +314,7 @@ p.parseMessage =  function() {
         };
 
         var fnc = this["parse" + String.fromCharCode( id )];
-        return fnc instanceof Function ? fnc( msg ) : msg;
+        return fnc instanceof Function ? fnc.call( this, msg ) : msg;
       }
 
       throw new Error("Unrecognized message code " + id);