ported fix for #612 to 1.x (#614)

Author: skwakman

lib/Server.js

@@ -268,7 +268,7 @@ function Server(compiler, options) {
 
 	var defaultFeatures = ["setup", "headers", "middleware"];
 	if(options.proxy)
-		defaultFeatures.push("proxy");
+		defaultFeatures.push("proxy", "middleware");
 	if(options.historyApiFallback)
 		defaultFeatures.push("historyApiFallback", "middleware");
 	defaultFeatures.push("magicHtml");