Start on adding ProjectSurvey and GradingProjectSurvey.
New classes still need to be made for logic and views so the appropriate methods can be overwritten.
Reviewed by: Lennard de Rijk
"""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