Add a 'pick' view to the appropriate views
Only views that represent entities that are pointed to by a
ReferenceProperty at some point are considered 'appropriate'.
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