Added and enabled new access check for viewing ProjectSurvey records.
Org Admins, project Mentors and project Students are now allowed to see their own ProjectSurveyRecords.
Note however that Students and Mentors have no interface yet to find the whereabouts of their records.
Fixes Issue 659.
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