Allow for setting a edit_cancel_redirect
Defaults to list view for the entity but can be overriden by setting
the parameter manually. Falls back to history.go(-1) if not set.
Patch by: Sverre Rabbelier
"""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