undo this: ImageDimension moved to its own class.
(cherry picked from commit 91d588fa80092a38801da8eeeb9c145b834bd855)
ImagesController Fix embedded link to image.
ImagesController Fix embedded link to image.

Merge branch 'topic_np_image_gallery_from_itsisu' into topic_au_np_rational_images

* topic_np_image_gallery_from_itsisu:
  undo this: ImageDimension moved to its own class. (cherry picked from commit 91d588fa80092a38801da8eeeb9c145b834bd855)