WIP - Allow multiple files to be uploaded in one request.

curl -F "data=@file1.csv;type=text/csv" \
     -F "data=@file2.csv;type=text/csv" \
     -F "data=@file3.csv;type=text/csv"
Don't return a Location header.
fix issue with arg type.
Merge pull request #141 from MastodonC/feature/multi-file-upload

Allow multiple files to be uploaded in one request.
First cut at a photo migrator old-embed -> hecuba.

Still has some issues, but the bones are there.

It seems that some of the paths in the existing data are invalid.

e.g.

select id, photos from entities where
id='adce5e2650f7532e26b969a3f8743fab3df7cadd';

the path to the photo doesn't exist.
photo migrator works, and is a bit more forgiving.