Touched readme.
Merge branch 'dev' into feature/analytics
Added migration for basic module to save analytics info.
Inserted analytics statements into views.
Added explanation of namedtuple usage.
Fixed typo.
Update README.md
Fixed unit test failure caused by trying to save an AnonymousUser.
Fixed warning pertaining to naive datetime (timezone unaware).
Added a controlled vocabulary for tracking objects.
Refactored unit tests.
Added tracking for instructor actions and API endpoint for tracking card views by learners.
Merge pull request #120 from Harvard-ATG/feature/analytics

feature/analytics