Added view to GradingSurveyGroup to list all records for a specified group.
This view will later be extended with options to start Tasks for collecting the data and processing it.
"""Multi-consumer multi-producer dispatching mechanism
Originally based on pydispatch (BSD) http://pypi.python.org/pypi/PyDispatcher/2.0.1
See license.txt for original license.
Heavily modified for Django's purposes.
"""
from django.dispatch.dispatcher import Signal