Feature/ws windows (#86)

* try to build ws on window on travis 📮

* cmake invocation fixed on windows 🐝

* Can use mbedtls to calculate hmac + no openssl config option

* build only windows on travis 🕢

* run msbuild 💷

* proper command to build 🕛

* some build fixes

* change weird sizeof call 🐙

* warning and missing includes fixes 💮

* ifdef out statsd code on windows 🐍

* logic invertion in ifdef 👄

* bring back makefile 📜

* command line tool is built with mbedtls 🏥

ws/snake/IXSnakeProtocol.h

@@ -7,6 +7,7 @@
 #pragma once
 
 #include <memory>
+#include <string>
 
 namespace ix
 {