Real ping (#32)

* close method change and fix code

* missing mutex

* wip

* renaming and fixes

* renaming, fixes

* added enablePong/disablePong, add tests

* added new test cases

* add 1 test case

* fix gcd name to greatestCommonDivisor

* move ping and ping timeout checks into socket poll, local var in test cases and indent fixes

* indent issue

ixwebsocket/IXWebSocketServer.h

@@ -33,6 +33,9 @@ namespace ix
         virtual ~WebSocketServer();
         virtual void stop() final;
 
+        void enablePong();
+        void disablePong();
+
         void setOnConnectionCallback(const OnConnectionCallback& callback);
 
         // Get all the connected clients
@@ -41,6 +44,7 @@ namespace ix
     private:
         // Member variables
         int _handshakeTimeoutSecs;
+        bool _enablePong;
 
         OnConnectionCallback _onConnectionCallback;
 
@@ -48,6 +52,7 @@ namespace ix
         std::set<std::shared_ptr<WebSocket>> _clients;
 
         const static int kDefaultHandShakeTimeoutSecs;
+        const static bool kDefaultEnablePong;
 
         // Methods
         virtual void handleConnection(int fd,