Added minimum age property to Program model.
This will allow hosts to specify a minium age requirement for Students wanting to participate in a program.
Reviewed and edited 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