(Angular2 RC5)如何使用SystemJS为每个模块创建可由路由器延迟加载的捆绑包？

(function (global) {
  System.config({
    paths: {
      'npm:': 'node_modules/'
    },
    map: {
      app: 'app',
      '@angular/core': 'npm:@angular/core/bundles/core.umd.js',
      '@angular/common': 'npm:@angular/common/bundles/common.umd.js',
      '@angular/compiler': 'npm:@angular/compiler/bundles/compiler.umd.js',
      '@angular/platform-browser': 'npm:@angular/platform-browser/bundles/platform-browser.umd.js',
      '@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic/bundles/platform-browser-dynamic.umd.js',
      '@angular/http': 'npm:@angular/http/bundles/http.umd.js',
      '@angular/router': 'npm:@angular/router/bundles/router.umd.js',
      '@angular/forms': 'npm:@angular/forms/bundles/forms.umd.js',
      'rxjs': 'npm:rxjs',
      'angular-in-memory-web-api': 'npm:angular-in-memory-web-api/bundles/in-memory-web-api.umd.js'
    },
    packages: {
      app: {
        main: './main.js',
        defaultExtension: 'js'
      },
      rxjs: {
        defaultExtension: 'js'
      }
    }
  });
})(this);

<script src="node_modules/systemjs/dist/system.src.js"></script>
<script src="systemjs.config.js"></script>
<script>
  System.import('app').catch(function(err){ console.error(err); });
</script>

import { Routes, RouterModule } from '@angular/router';
import { ModuleWithProviders } from '@angular/core';

import { HomeComponent } from './home.component';
import { AboutComponent } from './about.component';

const appRoutes: Routes = [
  { path: '', component: HomeComponent },
  { path: 'about', loadChildren: 'app/about.module#AboutModule' }
];

export const routing: ModuleWithProviders = RouterModule.forRoot(appRoutes);

import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';

import { AboutComponent } from './about.component';

@NgModule({
  imports: [
    CommonModule
  ],
  declarations: [
    AboutComponent
  ]
})
export class AboutModule { }

import { Component } from '@angular/core';

@Component({
  template: '<h2>About Page</h2>'
})
export class AboutComponent { }

import { Component } from '@angular/core';

@Component({
  template: '<h2>Home Page</h2>'
})
export class HomeComponent { }

import { Component } from '@angular/core';

@Component({
  selector: 'my-app',
  template: `
    <h1>My App</h1>
    <nav>
      <a routerLink="/">Home</a>
      <a routerLink="/about">About</a>
    </nav>
    <router-outlet></router-outlet>
  `
})
export class AppComponent { }

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { AppModule } from './app.module';

platformBrowserDynamic().bootstrapModule(AppModule);