Add files for demonize celery via systemd.
Edit tutorial for demonizing
Fix tutorial
Fix tutorial
More fixes
Fix
Add in tutorial
Remove celery config file
The help about environment variables
The help about environment variables
Commented out the "Environment" by default
Handle any MongoDB connection option inline
Fixes bug with solo/threads pool.  Closes #1548
Updates changelog for 3.0.24
get_pickleable_etype must actually return a value... Closes #1556
Adds C_FAKEFORK envvar for simple init script/multi debugging

This means that you can now do:

    C_FAKEFORK=1 celery multi start 10

or

    C_FAKEFORK=1 /etc/init.d/celeryd start

to avoid the daemonization step to see errors that are not visible
due to missing stdout/stderr.

Conflicts:
	celery/bin/celeryd_detach.py
Doc fixes
Updated with new setuptools bundles
Removes maybe_block
Wording