work around a jquery 1.9 change for .attr('value')

For whatever reason, .attr('value') on a textarea no longer gets its
value reliably. Using the native element's value property works.

h/js/directives.coffee

@@ -34,8 +34,7 @@ markdown = ['$filter', '$timeout', ($filter, $timeout) ->
 
     # React to the changes to the text area
     input.bind 'blur change keyup', ->
-      value = input.attr('value') or ''
-      ctrl.$setViewValue value
+      ctrl.$setViewValue input[0].value
       scope.$digest()
 
     # Auto-focus the input box when the widget becomes editable.