TNL-4351 Fix bug with no-option reponses

It's valid for an assessment to have option = None.

Includes unit test addition.

Update version to 1.1.2

Handle IntegrityError according to 1.8 conventions.

Version update to 1.1.1

Fix oa_block release state status

Version 1.1.0

Move ORA data download logic into ora2 repo.

Use passed-in requesting_user_id

Since this method is called in an unbound context, we must rely on
a user_id to be passed in to this method. Tests and comments as well.

Post-RC fixes

Version 1.0.1

Updates to account for a11y CSS changes

Updates to account for recent CSS changes in platform. Changes made include:
- Removing h3 element response__submission__status__title, this is more properly just a div
- Removing style %t-subheading, as %t-titlecase breaks a11y so %t-heading may be used everywhere
- Adding staff-assessment__display__header and staff__grade__title to _shame.css
- Modifying acceptance tests to account for loss of %t-titlecase

Fix leaderboard PDFs

PDF files cannot be displayed in an `<img>` tag, we should be using the pre-made template.
Also moving the image below the response because it looked weird above. Tests updated.

Update submissions version

Catch the change made at https://github.com/edx/edx-submissions/pull/39

Version 1.0.0 release

Seeing as ora2 is reasonably stable at this point, having been in
production for some time, I move that we transition our versioning
scheme from "arbitrarily increment the last digit in 0.2.x" to
semantic versioning as recommended by GitHub.

This is arbitrarily being declared the 1.0.0 release, all subsequent
releases should follow the guidlines described at http://semver.org/

Revert package name change

This recent change broke requirements.txt installs

Weekly translation updates

Mathjax upgrade

Ora -e

Fix for leaderboard image bug