title: How to access a form in a directive from the controller?
body: <p>I have an Angular directive that contains a form with validation.  I want to have a button in my view that gets disabled when this directive's form is <code>$pristine</code>, but the button exists in the view at the level of the controller, so I have no access to the child form inside the directive.</p>
  
  <p>How can I access the form inside the directive from the parent controller without doing some weird hack?</p>