Removed the grade_choices keyword argument from GradeSurveyTakeForm. This is because this class already assumes very specific things about the grade_choices keyword argument. Therefore it is now a constant inside this class.

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