6.x

Buggy 1.4 release for 6.x.

alpha5 had drush errors for installation, this *should* fix it.

Now you can alter messages before they are published: check amqp.api.php for more information.
Rename consumer to consumers to better reflect hook implementation.
Cleanup.

Issue #1448294 by vitalie: Adds cache control headers

API improvements, more documentation.

Backport of the 7.x-1.0 version.