Adds Dane Guempel to AUTHORS
Add libzmq 3.2.x compatibility.

pyzmq compiled with zeromq-3.2 does not have HWM socket opt. Instead
of this, exists SNDHWM that replaces it.
Adds Andrey Antukh <niwi@niwi.be> to AUTHORS
Tests passing
2to3 barfs on docstring.  Fixes #187
Bumps version to 2.5.4
Updates changelog
Add long-polling support to SQS transport

The polling interval was set to 0 and a new
transport option (wait_time_seconds) was added.  This
parameter specifies how long to wait for a message from
SQS, and defaults to 20 seconds, which is the maximum
value currently allowed by SQS.

Fixes #176.  Closes #198.
Adds James Saryerwinnie to AUTHORS
Merge branch '2.5'
Merge branch 'master' of github.com:celery/kombu
Merge branch 'master' of https://github.com/celery/kombu