Pool: Worker process support for gdb by allowing for EINTR in select
Need to call finally blocks at SIGTERM. Maybe fixes celery/celery#1266
Pool: Cleanup of all signals, not just SIGTERM
fix exit code
Python 3 fixes.
Python 3 fixes.
Merge branch '2.7'

Conflicts:
	billiard/_connection.py
	billiard/pool.py
	billiard/queues.py
	billiard/util.py