title: NgUpgrade: Unable to use templateUrl when upgrading Angular1 components
body: <p>I want to upgrade a ng1 component to be used inside an ng2 component. </p>
  
  <p>If I use just a template string the ng1 component, to be upgraded, it works.  However, if I switch to using a templateUrl instead, the app crashes and give me this error: </p>
  
  <pre><code>angular.js:13920 Error: loading directive templates asynchronously is not supported
  at RemoteUrlComponent.UpgradeComponent.compileTemplate (upgrade-static.umd.js:720)
  at RemoteUrlComponent.UpgradeComponent (upgrade-static.umd.js:521)
  at new RemoteUrlComponent (remote-url.component.ts:11)
  at new Wrapper_RemoteUrlComponent (wrapper.ngfactory.js:7)
  at View_AppComponent1.createInternal (component.ngfactory.js:73)
  at View_AppComponent1.AppView.create (core.umd.js:12262)
  at TemplateRef_.createEmbeddedView (core.umd.js:9320)
  at ViewContainerRef_.createEmbeddedView (core.umd.js:9552)
  at eval (common.umd.js:1670)
  at DefaultIterableDiffer.forEachOperation (core.umd.js:4653)
  </code></pre>
  
  <p>Here is a plunk demonstrating my issue:</p>
  
  <p><a href="https://plnkr.co/edit/2fXvfc?p=info" rel="noreferrer">https://plnkr.co/edit/2fXvfc?p=info</a></p>
  
  <p>I've followed the Angular 1 -> 2 upgrade guide and it seems that this code should work.  I'm not quite sure why its not working.  </p>