per message deflate support (with zlib)

ixwebsocket/IXWebSocketHttpHeaders.h

@@ -0,0 +1,15 @@
+/*
+ *  IXWebSocketHttpHeaders.h
+ *  Author: Benjamin Sergeant
+ *  Copyright (c) 2018 Machine Zone, Inc. All rights reserved.
+ */
+
+#pragma once
+
+#include <string>
+#include <unordered_map>
+
+namespace ix 
+{
+    using WebSocketHttpHeaders = std::unordered_map<std::string, std::string>;
+}