====================
ATFolder integration
====================

  >>> self.setRoles(['Manager'])
  >>> id = portal.invokeFactory('Folder', id='testfolder', title='Title')
  >>> folder = portal[id]

ATFolders should have a working ImageView adapter that takes the first image inside it:

  >>> foo = folder.invokeFactory('Image', id='image1', image=img)
  >>> folder.restrictedTraverse('image_thumb')
  <Image at ...>

