Don't instantiate default app
MongoDB: Fixes typo use_greenlet -> use_greenlets
Now depends on kombu 3.0.1
Fixes bug with revoke list only terminating one task.  Closes #1592
AMQP Backend: Get many must prepare exceptions
First steps: Adds troubleshooting section.  Closes #1584
Improve daemonization tutorials troubleshooting section
Adds Security section to contributing
adding on_loop_stop signal and test
adding self to contributors
using api for worker_process_shutdown signal. documenting it
test passes individually, added docstring
first pass at keeping track of worker processess / tasks, uses worker process names...
finished functionality for kill case, changed naming, removed comments
removing comments, cleaning up
removing spaces