Added blocks.middleware.

As discussed in astoilkov#95.

src/node/methods.js

@@ -1,11 +1,17 @@
 define([
   '../core',
   './Server',
-], function (blocks, Server) {
+  './Middleware'
+], function (blocks, Server, Middleware) {
   blocks.server = function (options) {
     return new Server(options);
   };
 
+  blocks.middleware = function (options) {
+  	var middleware = new Middleware(options);
+  	return blocks.bind(middleware.tryServePage, middleware);
+  };
+
   blocks.static = function (options) {
 
   };