Problem when pressing Esc on a datepicker

[jcstritt]

When you have the cursor on the input field of a datepicker, an Esc key press is not propagated to the parent component (a modal box for example), so that the box does not close. When you make the change below on the "scope.keydown" function of this directive, all is ok. For me it's a bug in the two last releases :

      scope.keydown = function(evt) {
        if (evt.which === 27) {
          evt.preventDefault();
          if (scope.isOpen) { // new check here !!!
            evt.stopPropagation();
          }  
          scope.close();
        } else if (evt.which === 40 && !scope.isOpen) {
          scope.isOpen = true;
        }
      };