#routers

Using babel enhance [koa-router][1].Add namespace and named middleware.

Added function

1.Named middleware

Basic usage:

 var router = new Router();
 var middlewareCount = 0;

 var middlewareA = function *(next) {
   middlewareCount++;
   yield next;
 };

 var middlewareB = function *(next) {
   middlewareCount++;
   yield next;
 };

 router.registerMiddleware("A", middlewareA);
 router.registerMiddleware("B", middlewareB);

 router.get('/users/:id', {middleware: 'A|B'}, function *() {
   this.body = { hello: 'world' };
 });

2.Route group

Basic usage:

 var router = new Router();

 router.group({prefix: '/things/:thing_id'}, function() {
   router.get('/', function *() {
     this.body = 'test';
   });

   router.get('/users/:id', function *() {
     this.body = 'test';
   });
 });

middleware group

 var router = new Router();

 router.group({middleware: 'A|B'}, function() {
   router.get('/', function *() {
     this.body = 'test';
   });

   router.get('/users/:id', function *() {
     this.body = 'test';
   });
 });

TODO

1. Controller maybe not
2. CORS
3. Metrics
4. Consul support [1]:https://github.com/alexmingoia/koa-router