Cohorts PR - WIP
Cohorts PR - WIP

Updated prod demo course to assign grade-able questions to four
different cohorts, test case checks that two different cohorts get 2
different videos, 2 different questions, and get graded only on
successfully answering the 1 question that is visible to them.

Need to update stage demo course tomorrow and verify that test passes
there before officially PR-ing and passing to Greg.

stvstnfrd/SeleniumTests