Linux /bin/sh (GNU) is not the same as OS X /bin/sh (BSD), so use /bin/bash.
Fixes:
scripts/pylint/do_pylint.sh: 27: Syntax error: "(" unexpected
on Ubuntu (and possibly other Linux distros).
Patch by: Todd Larsen
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