- Remove usage of django.urls.patterns
- Change urls tuples to lists
- Make all string view names callables
- This is the second of several urls updates for LMS; a work in progress

This endpoint returns course metadata relating to discussions as a
starting point for clients.

This is an initial implementation that only allows retrieval of all
threads for a course and only returns an easily computed subset of the
fields that are needed, in order to keep this change from getting too
large.

JIRA: MA-641

This is the first stage of the new Discussion API.

JIRA: MA-604