Adds the removal of requests from the datastore when a new role entity is created.
This uses the classname from the role entity as the type of role in the request.
Patch 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