Update django-queryset-csv and django-tinsel to Python 3 versions

[jwalgran]

Overview

Support for Python 3 was added before these versions, but was only correctly declared in the patch releases.

Connects #3278

Demo

Notes

The django-queryset-csv upgrade also includes Django 2 compatibility but the changes are minor

https://github.com/azavea/django-queryset-csv/pull/100/files

Testing Instructions

These assume you are starting in the otm-cloud working directory and the this branch is checked out in otm-cloud/src/otm-core

• Provision the app VM vagrant up app --provision
• Verify the installed versions
  • vagrant ssh app -c "pip freeze | grep django-queryset-csv"
  • vagrant ssh app -c "pip freeze | grep django-tinsel"
• pip install caniusepython3 and verify caniusepython3 results
  • caniusepython3 -r src/otm-core/requirements.txt
  • caniusepython3 -r src/otm-core/test-requirements.txt
  • caniusepython3 -r src/otm-core/dev-requirements.txt
  • caniusepython3 -r src/otm-core/travis-requirements.txt
  • caniusepython3 -r src/otm-addons/requirements.txt
• Verify that the unit tests pass ./scripts/manage.sh test

Checklist

• [ ] fixup! commits have been squashed
• [ ] CI passes after rebase

[coveralls]

Coverage remained the same at 83.784% when pulling 4023b1ac3c36e369445bec39f00b73cf44a1d989 on jcw/update-djqscsv-and-tinsel into b3a7e287a7603c06ad5cac12d4b03219f9d19113 on develop.

[jwalgran]

Thanks for the review.