Eventlet support in master and master branch frozen.

[Ask Solem]

People,

The master branch is now frozen, and no new features will be added to 2.2.0.
This will be a great release, so be sure to try it out as soon as you can so we can
get it tested enough to release.

Eventlet pool support is in too, and not just running in another thread or process, it's
running directly in the consumer process.

A -P, --pool argument to celeryd has been added, and you can currently
choose between processes, eventlet and gevent.

See examples/eventlet:
https://github.com/ask/celery/tree/master/examples/eventlet/

Small video of celeryd + eventlet making 100 async web requests:
http://bit.ly/euPmiH

Note: gevent support may not be working correctly, it's not as complete as eventlet support
yet, but it should be small matter to complete.

Hunt bugs!

--
{Ask Solem,
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