Modifies models that handle ingest to add the video_s and image_s fields to the solr docs that are created. These values come from pbcore xml. File extensions ".mp4" and ".jpg" are added to they match up with actual files on the media server. The files on the media server are created from the master videos in DAM. They are uploaded separately.

NOTE: in the case of WCVB, the images created have a ".jpeg" extension instead of ".jpg".