title: formGroup expects a FormGroup instance
body: <p>I have an Angular 2 RC4 basic form example on Plunkr that appears to throw the following error (In Chrome DEV console)</p>
  
  <p>Here's the plunkr</p>
  
  <p><a href="https://plnkr.co/edit/GtPDxw?p=preview" rel="noreferrer">https://plnkr.co/edit/GtPDxw?p=preview</a></p>
  
  <p>Error:</p>
  
  <pre><code>browser_adapter.ts:82 EXCEPTION: Error: Uncaught (in promise): EXCEPTION: Error in ./App class App - inline template:1:7
  ORIGINAL EXCEPTION: formGroup expects a FormGroup instance. Please pass one in.
             Example: &lt;form [formGroup]="myFormGroup"&gt;
  
  ORIGINAL STACKTRACE:
  Error: formGroup expects a FormGroup instance. Please pass one in.
             Example: &lt;form [formGroup]="myFormGroup"&gt;
  
      at new BaseException (https://npmcdn.com/@angular/forms@0.2.0/src/facade/exceptions.js:27:23)
      at FormGroupDirective._checkFormPresent (https://npmcdn.com/@angular/forms@0.2.0/src/directives/reactive_directives/form_group_directive.js:110:19)
      at FormGroupDirective.ngOnChanges (https://npmcdn.com/@angular/forms@0.2.0/src/directives/reactive_directives/form_group_directive.js:39:14)
      at DebugAppView._View_App0.detectChangesInter
  </code></pre>