Feature/redis (#23)

* Fix warning

* (cmake) add a warning about 32/64 conversion problems.

* simple redis clients

* can publish to redis

* redis subscribe

* display messages received per second

* verbose flag

* (cmake) use clang only compile option -Wshorten-64-to-32 when compiling with clang

ws/ws.h

@@ -39,4 +39,14 @@ namespace ix
 
     int ws_send_main(const std::string& url,
                      const std::string& path);
+
+    int ws_redis_publish_main(const std::string& hostname,
+                              int port,
+                              const std::string& channel,
+                              const std::string& message);
+
+    int ws_redis_subscribe_main(const std::string& hostname,
+                                int port,
+                                const std::string& channel,
+                                bool verbose);
 }