* Initial implementation of a REST Export serializer for IIIF Manifests
* Coding standards
* Pass full URL to IIIF
* Basic implementation of manifest per https://iiif.io/api/presentation/2.1/#manifest
* Remove unused variable
* Remove dependency for OSD, add config variable for IIIF server
* Update settings.yml
* Fix key name
* fix schema/settings issue
* Broaden approach of discovering file/image fields