#3868: Load Media Browser to select image for cropping.
#3868: JS file
#3868: Try to use existing AJAX to start crop tool
#3868: Crop form loads and appears to be functional.
#3868: Form saves with no errant validation errors.
#3868: Cleanup
#3868: Fix bugs with removing and adding new image again.
#3868: Prevent non-images from appearing in library
Merge branch 'SCHOLAR-3.x' into 3868-media_imagefield_crop
#3868: Remove imagefield_crop derivatives from media browser, always display version of image in preview
#3868: Place the Media Browser on top of the cropper tool.
Apply comments from the code review.
Merge branch 'SCHOLAR-3.x' into alias-purl.
Minor fixes
When creating a alias not in a vsite context the user must enter a purl address.
Adding documentation.
Fix test.
Comment out tests and remove useless code.
Remove old test.
Bring back the custom domain functionality(with shared domain).