Added a simple reverse proxy handler.

- For now, it does not support SSL connection on the target yet.
- No external config file support, this is all about coding.

examples/proxy/server.ini

@@ -0,0 +1,8 @@
+verbose=true
+verbose_level=ALERT
+port=9090
+#max_concurrent_connections=100
+#keep_alive_timeout=15
+#max_tcp_clients=100
+#socket_timeout=300
+#max_keep_alive_requests=300