Description:
------------
When using AMQPQueue to read messages, it reads messages 
correctly. However, using the AMQP_NOACK flag seems to have no 
effect as messages are still being acknowledged. It appears 
others have experienced this as well (search StackOverflow).

Reproduce code:
---------------
<?php

// Example borrowed from http://www.php.net/manual/en/amqp.examples.php#104117

$exchangeName = 'myexchange';
$routingKey = 'routing.key';
$queueName = 'myqueue';

// connect
$connection = new AMQPConnection();
$connection->connect();

// setup our queue
$q = new AMQPQueue($connection);
$q->declare($queueName);

// Bind it on the exchange to routing.key
$q->bind($exchangeName, $routingKey);

// show the message
print_r($q->get(AMQP_NOACK));

// Should return same message in theory
print_r($q->get(AMQP_NOACK));

$connection->disconnect();

Expected result:
----------------
Same message returned as previous get() not acknowledged

Actual result:
--------------
The next message in the queue and queue count decremented by 
1.