title: TemplateUrl is not working with System.js
body: <p>I have following structure of folder. When i am using templateUrl in app.component.ts it says</p>
  
  <pre><code> "Failed to load app.component.html ; Zone: &lt;root&gt; ; Task: Promise.then ; 
    Value: Failed to load app.component.html "
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/xdXYz.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/xdXYz.png" alt="enter image description here"></a></p>
  
  <p>app.component.ts</p>
  
  <pre><code>import { Component } from '@angular/core';
  
  @Component({
    selector: 'my-app',
    templateUrl: './app.component.html'
  })
  export class AppComponent { name = 'Angular'; }
  </code></pre>
  
  <p>system.config.js</p>
  
  <pre><code>System.config({
      defaultJSExtensions: true,
      map: {
          app:"applicationStartup",
          '@angular/core': 'node_modules/@angular/core/bundles/core.umd.js',
          '@angular/common': 'node_modules/@angular/common/bundles/common.umd.js',
          '@angular/compiler': 'node_modules/@angular/compiler/bundles/compiler.umd.js',
          '@angular/platform-browser': 
               'node_modules/@angular/platform-browser/bundles/platform-browser.umd.js',
          '@angular/platform-browser-dynamic': 
               'node_modules/@angular/platform-browser-dynamic/bundles/platform-browser-dynamic.umd.js',
          '@angular/router': 'node_modules/@angular/router/bundles/router.umd.js',
          'rxjs': 'node_modules/rxjs'
      },
      packages : {
          app : {
                  main : '../../build/main.js',
                  defaultJSExtensions : 'js'
              },
          rxjs :{
              defaultJSExtensions : "js"
          }
      }
  });
  </code></pre>
  
  <p>app.module.ts</p>
  
  <pre><code>import { NgModule }      from '@angular/core';
  import { BrowserModule } from '@angular/platform-browser';
  import { AppComponent }  from './app.component';
  
  @NgModule({
    imports:      [ BrowserModule ],
    declarations: [ AppComponent ],
    bootstrap:    [ AppComponent ]
  })
  export class AppModule { }
  </code></pre>
  
  <p>Index.html : i have imported app which is defined in system.config.js</p>
  
  <pre><code>&lt;html&gt;
  &lt;head&gt;
    &lt;script src="node_modules/core-js/client/shim.min.js"&gt;&lt;/script&gt;
    &lt;script src="node_modules/zone.js/dist/zone.js"&gt;&lt;/script&gt;
    &lt;script src="node_modules/reflect-metadata/Reflect.js"&gt;&lt;/script&gt;
    &lt;script src="node_modules/systemjs/dist/system.src.js"&gt;&lt;/script&gt;
    &lt;script src="systemjs.config.js"&gt;&lt;/script&gt;
    &lt;script&gt;
      System.import('applicationStartup').catch(function (err) {
        console.error(err);
      });
    &lt;/script&gt;
  &lt;/head&gt;
  
  &lt;body&gt;
    &lt;my-app&gt;Loading...&lt;/my-app&gt;
  &lt;/body&gt;
  
  &lt;/html&gt;
  </code></pre>
  
  <p>Can you please suggest what can be the reason</p>