Fixes #69, fixing deletion issue
updating output string to show a better message after cleanup
Moving uploaded attachments out of the database. Working on #54.

* Added file upload service
* Added fileUrl attribute to Attachment (content still exists so we don't corrupt legacy data)
Adding description for DatabaseCleanUpController class
Refactoring DatabaseCleanUpController and applying Groovy coding style
Adding database image migration service. Working on #54
Added migration action to AttachmentController. Working on #54.
Fixes #54. To run the migration just use the  endpoint.
updating output message to support xml,json format
Merge pull request #77 from OxBRCInformatics/feature/69_database_cleanup_for_deletion

Looks good :+1:
Merge pull request #83 from OxBRCInformatics/feature/54_images_in_domain_class

Soheil says it's fine :). Peer reviewed with Grant and @SoheilSaif.
merging from develop