Set default taking access for GradingProjectSurvey to org.
This will allow Mentors and Org Admins to take GradingProjectSurveys in case that an Org Admin has no Mentor roles.
Coverage: code coverage testing for Python
Coverage.py is a Python module that measures code coverage during test execution.
It uses the code analysis tools and tracing hooks provided in the Python standard
library to determine which lines are executable, and which have been executed.
For more information, see http://nedbatchelder.com/code/modules/coverage.html