title: angular 2 downgrade on directives not working
body: <p>I am trying to downgrade angular 2 directives to use with Angular 1.5 app.
  We are able to downgrade Angular 2 components , but not directives.</p>
  
  <pre><code>    import { Directive, ElementRef, Input, Renderer } from '@angular/core';
      import { UpgradeComponent } from '@angular/upgrade/static';
  
      @Directive({
          selector: 'myDir'
      })
      export class MyDirective {
          constructor(public el: ElementRef, public renderer: Renderer) {
              console.log('constructor');
          }
          ngOnInit() {
              console.log("onInit");
          }
      }
  
    angular.module(myapp)
              .directive('myDir', downgradeComponent({ component: MyDirective }));
  </code></pre>
  
  <p>When i try to use the directive in Angular 1 app, it's not firing the constructor or ngOnInit.</p>
  
  <p>This is how i am using it.</p>
  
  <pre><code> &lt;myDir&gt;&lt;/myDir&gt;
  </code></pre>