Remove getCallback indirection in modules
Instead, assume that the imported module contains the Callback class
that was previously returned by getCallback. This is done to prevent
a circular import (caused by the __init__ importing a submodule).
"""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