Added view for editing GradingRecords.
This view shows a list of GradingRecords if the id param is not present in the GET data.
Also renamed grading_record to view_records and fixed the redirect for that page
to also point to the GradingRecord edit page.
[nosetests]
exclude=pymox
with-coverage=1
cover-package=soc
cover-erase=1
cover-html=1
cover-html-dir=coverageResults
#debug=nose.plugins.cover