more detail in debug msg, on loop stop. adding test doesnt work yet
Revert "call to join no longer needs to be wrapped in conditional"

This reverts commit d219e5d1140fd658907c6dc233f5844df23884a1.
Update CONTRIBUTORS.txt

add myself to the contributors list
Adds Celery.task_cls to set the base task type
Quickfix ;)
Merge branch 'master' of https://github.com/celery/celery into mujin