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/ixcrypto/IXHMac.cpp

@@ -3,10 +3,14 @@
  *  Author: Benjamin Sergeant
  *  Copyright (c) 2018 Machine Zone. All rights reserved.
  */
+
 #include "IXHMac.h"
 #include "IXBase64.h"
 
-#ifdef __APPLE__
+#if defined(IXWEBSOCKET_USE_MBED_TLS)
+# include <mbedtls/md.h>
+#elif defined(__APPLE__)
+#  include <ixwebsocket/IXSocketMbedTLS.h>
 # include <CommonCrypto/CommonHMAC.h>
 #else
 # include <openssl/hmac.h>
@@ -19,7 +23,12 @@ namespace ix
         constexpr size_t hashSize = 16;
         unsigned char hash[hashSize];
 
-#ifdef __APPLE__
+#if defined(IXWEBSOCKET_USE_MBED_TLS)
+        mbedtls_md_hmac(mbedtls_md_info_from_type(MBEDTLS_MD_MD5),
+               (unsigned char *) key.c_str(), key.size(),
+               (unsigned char *) data.c_str(), data.size(),
+               (unsigned char *) &hash);
+#elif defined(__APPLE__)
         CCHmac(kCCHmacAlgMD5,
                key.c_str(), key.size(),
                data.c_str(), data.size(),