Add a grade field to the Grading Project Survey form. This also takes care of validating and transforming the data into True(pass) or False(fail). GradingProjectSurveys are hereby working for developers. Reviewed by: Lennard de Rijk

[nosetests]
exclude=pymox
with-coverage=1
cover-package=soc
cover-erase=1
cover-html=1
cover-html-dir=coverageResults
#debug=nose.plugins.cover