OPEN - task 131: Update docs to reflect oppia.viz and how to use this 
https://github.com/DigitalCampus/django-oppia/issues/issue/131
OPEN - task 130: Add descriptions to util files and update docs to
reflect the new util files 
https://github.com/DigitalCampus/django-oppia/issues/issue/130
OPEN - task 130: Add descriptions to util files and update docs to
reflect the new util files 
https://github.com/DigitalCampus/django-oppia/issues/issue/130