Added SurveyRecordModel.
Lennard: On top of the orginial patch I've added several comments to the fields and two TODO's for further subclassing.
Patch by: James Levy, Daniel Diniz, Lennard de Rijk
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