Fixed not working to edit a doc that selected from the docs list view. soc/templates/soc/docs/list/docs_row.html not full updated.
Patch by: Chen Lunpeng
Review by: to-be-reviewed
"""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