WIP image hash
Removing `PageImageRelationship` and `PageImageRelationshipService`
Remove their tests as well
Remove reference to missing class in `ImageService`
Finished removing references to `PageImageRelationship` and its service
Add method to retrieve images by package Id
No more looking up images by page
Update database structure and data model to include packageId on `Image`
Restoring test suite
Image migration now working again
Removing selectByFilename, b/c it's bad
Data migration is working again :)
Remove filename and package_id from `Image`
Package download works again, appears all images are in place.
Merge pull request #6 from CruGlobal/remove-page-image

Remove page image