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.

from django.dispatch import Signal

request_started = Signal()
request_finished = Signal()
got_request_exception = Signal(providing_args=["request"])