Added a property and accessors for the original checksum of the image
Set the original checksum of the image
Added a filter for original checksums
Updated docs with info on the originalChecksum field
Added originalChecksum fields to the SQL scripts
Set originalChecksums in the query object if they exist in the query params
Added support for originalChecksum
Make sure to output the originalChecksum fields
Added originalChecksum to the output
Updated tests
Updated ChangeLog
Updated docs regarding upgrading Imbo