Add a Rake task for migrate DFID research outputs
Add a Rake task for migrate DFID research outputs

We're moving these to a new finder with a new document type, base path
and metadata fields. This Rake task should migrate the documents one by
one over to the new finder by republishing new editions of the document
with the payload transformed to the new format.

alphagov/specialist-publisher,alphagov/specialist-publisher,alphagov/specialist-publisher