Redirect stdout/stderr through the logging system.
This change also causes the uncaptured output of subprocesses to
be routed to the logging system for recording in the session
transcript.
"""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