title: The directive [(ngModel)]= not working anymore in rc5
body: <p>ngModel is throwing exceptions, this worked fine in rc4</p>
  
  <pre><code>&lt;input [(ngModel)]="par.name" placeholder="name" /&gt;
  </code></pre>
  
  <p>These are the exceptions:</p>
  
  <blockquote>
    <p>zone.js@0.6.12?main=browser:260 Uncaught EXCEPTION: Error in
    ./CommunityListComponent class CommunityListComponent - inline
    template:10:27 ORIGINAL EXCEPTION: No value accessor for form control
    with unspecified name ORIGINAL STACKTRACE: Error: No value accessor
    for form control with unspecified name</p>
  </blockquote>