Add support for Apache Zookeeper as a transport
Merge remote-tracking branch 'upstream/master'

Conflicts:
	kombu/transport/zookeeper.py
Syncing with master
Add exchange to exchange binding support.
Add tests for exchange to exchange binding(exchange_bind and exchange_unbind)
Add default routing key to exchange_bind.
Modify complete_send/receive examples to use exchange to exchange binding
Better index for MongoDB transport messages collection
Connection: Support for multiple URLs and failover.

Either::

    Connection(['amqp://foo', 'amqp://bar'])

or:

    Connection('amqp://foo;amqp://bar')

Fixes celery/celery#616
Merge branch 'master' of github.com:celery/kombu
Can remove this now, solved the reason for the hack
Merge pull request #158 from rmihael/master

Better index for MongoDB transport

Thanks :)
Py25 uses it.next not __next__
Fixes bug when there's no Connection.cycle
Now depends on importlib+ordereddict if used with Python < 2.7, and simplejson if < 2.6
Fixes doc logo
Fixes logo url
Now depends on importlib+ordereddict if used with Python < 2.7, and simplejson if < 2.6
Updates Changelog
Bumps version to 2.4.6