old_contents: //
  // ## router
  //
  
  define([
    'helpers/namespace'
  ],
  
  function(app) {
  
    "use strict";
  
    var router, Router;
  
    Router = Backbone.Router.extend({
  
      routes: {},
  
    });
  
    router = new Router();
  
    app.namespace.setItem('router', router);
  
    Backbone.history.start();
  
    return router;
  
  });
  
new_contents: //
  // ## router
  //
  
  define([
    'helpers/namespace'
  ],
  
  function(app) {
  
    "use strict";
  
    var router, Router;
  
    Router = Backbone.Router.extend({
  
      routes: {
        '*default' :  'index'
      },
      
      index: function() {
        console.log('default route');
      }
  
    });
  
    router = new Router();
  
    app.namespace.setItem('router', router);
  
    Backbone.history.start();
  
    return router;
  
  });
  
subject: Update app/router.js