do not catch SIGILL, SIGSEGV, SIGFPE. See CERT's SIG35-C
Exiting signal handlers must not run again.  Related to #74
Ignore unknown signals.  Closes celery/celery#1573
Fallback for monotonic on Linux/OS X
Use monotonic() if available
add callback for on_loop_stop
added pid in toplevel run function to remove duplicate call to os.getpid(), removed extra call to on_loop_stop. would be great to pass in return type from workloop somehow...
Added comment and exitcode
Cosmetics for Issue #73
Updates CHANGES.txt
Version now 3.0.0.0
Sets release date for 3.0
Pool: Reset restart state in ACK instead of READY
providing api for deinit (worker process shutdown)