Remove django-celery dependency

Remove django-celery (#25)

- BOM-1334: Remove django-celery; it is no longer maintained, and might also block upgrade
to Django 2
- Upgrade deps; pin several to keep Django 1.11

Django 2.2 Support

Django 2.2 Support

Decode input if necessary

decode utf-8 encoded files before passing them to DictReader

0.9.4

Add optional operating_user kwarg to DeferrableMixin.save().

0.9.3

We now commit CSVOperation records to the database before async tasks start.

#19

Use user_id field for CSVOperation.user

If a class inheriting from DeferrableMixin has a field user_id, use that user for the CSVOperation

Reverse chronological ordering for history rows

Merge pull request #16 from edx/matthugs/change-ordering

Change ordering of history rows to be reverse chronological

0.7.1

Merge pull request #13 from edx/matthugs/add-processed-row-informatio…

0.6 Release

Merge pull request #10 from edx/dcs/quote-csum

Quote the checksum, to prevent spreadsheet transformation

0.5.1

Merge pull request #9 from edx/matthugs/fix-incorrect-django-rest-fra…