Completed the Create and Edit view for GradingSurveyGroup.
Note that I've added a TODO to redo _editPost to give us kwargs. Would also get rid of hidden fields elsewhere.
Reviewed by: Lennard de Rijk
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