Add `display_name` to the Data export XBlock.
Merge pull request #51 from mtyaka/dataexport-display-name

Add `display_name` to the Data export XBlock.
Mentoring assessment mode
Merge pull request #49 from aboudreault/mentoring-assessment-mode

Mentoring assessment mode
Fix typo in "assessment"
Keep submit button disabled after answering in assessment.

Once a student submits an answer in assessment mode, he should not be allowed
to change it, so stop listening for changes once an answer has been submitted.

The change lister would re-enable the submit button if the student changed their
answer, which shouldn't happen in assessment mode.
Merge pull request #52 from mtyaka/assessment-patch

Keep submit button disabled after answering in assessment.
display-name: Update usage of `display_name` to include upstream changes

It used to be on a separate proeperty - it's now using a real XBlock
field and its default value