Adding option to disable older SSL/TLS versions

Simply pass in "secureOptions" as you normally would to an https config object, and redbird will pass it along into the https proxy server.

Author: James9074

lib/proxy.js

@@ -252,6 +252,11 @@ ReverseProxy.prototype.setupHttpsProxy = function (proxy, websocketsUpgrade, log
     key: getCertData(sslOpts.key),
     cert: getCertData(sslOpts.cert)
   };
+  
+  // Allows the option to disable older SSL/TLS versions
+  if(sslOpts.secureOptions) {
+    ssl.secureOptions = sslOpts.secureOptions;
+  }
 
   if (sslOpts.ca) {
     ssl.ca = getCertData(sslOpts.ca, true);