Fix inheritance in soc.models.base module. FieldsProxy inherited from DbModelForm which was deleted in previous commits (replace that with BaseForm).
Patch by: Pawel Solyga
"""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