Add multy basic.consume support

As mentioned in issue https://github.com/pdezwart/php-amqp/issues/132, we don't have support for multiple `basic.consume` calls support, which limit AMQP protocol power significantly.

There was attempt to add support for multiple queues consumer (I guess PR https://github.com/pdezwart/php-amqp/pull/71 was about it in some way), but it adds too much code to solve such problem.

This PR allow us to omit specifying callback for `AMQPQueue::consume()` method and just send `basic.consume` AMQP method to broker (and assign consumer tag if call succeed).

Potentials cons may comes when multiple `AMQPQueue::consume()` called with different flags, like one with autoack enabled, and the other no, then acking message which delivered already auto-acked will lead to error.
This should not be a mission-critical for usage, but let's explain it:

Here is demonstration:

```php
<?php

$cnn = new AMQPConnection();
$cnn->connect();

$ch = new AMQPChannel($cnn);

$ex = new AMQPExchange($ch);
$ex->setName('exchange');
$ex->setType(AMQP_EX_TYPE_TOPIC);
$ex->declareExchange();

$q1 = new AMQPQueue($ch);
$q1->setName('queue-one');
$q1->declareQueue();
$q1->bind($ex->getName(), 'routing.one');

$q2 = new AMQPQueue($ch);
$q2->setName('queue-two');
$q2->declareQueue();
$q2->bind($ex->getName(), 'routing.two');

$ex->publish('message1', 'routing.one');
$ex->publish('message2', 'routing.two');

$counter = 2;

$q1->consume(null, AMQP_AUTOACK);
$q2->consume(function (AMQPEnvelope $envelope, AMQPQueue $queue) use ($counter) {
    echo $envelope->getDeliveryTag(), ' ', $envelope->getBody(), " ", $queue->getName(), PHP_EOL;
    $queue->ack($envelope->getDeliveryTag());
    return (--$counter > 0);
}, AMQP_NOPARAM);
```

Will gives us:
```
1 message1 queue-two
2 message2 queue-two
```
and will hang, and we'll get in rabbitmq log

```
{amqp_error,precondition_failed,"unknown delivery tag 1",'basic.ack'}
```


Also, it may be a bit ambiguous to have second argument passed to consumer callback (`AMQPQueue $queue`) always be a `AMQPQueue` object consumer callback was called from.

Here is demonstration:

```php
<?php

$cnn = new AMQPConnection();
$cnn->connect();

$ch = new AMQPChannel($cnn);
$ex = new AMQPExchange($ch);
$ex->setName('exchange');
$ex->setType(AMQP_EX_TYPE_TOPIC);
$ex->declareExchange();

$q1 = new AMQPQueue($ch);
$q1->setName('queue-one');
$q1->declareQueue();
$q1->bind($ex->getName(), 'routing.one');

$q2 = new AMQPQueue($ch);
$q2->setName('queue-two');
$q2->declareQueue();
$q2->bind($ex->getName(), 'routing.two');

$ex->publish('message1', 'routing.one');
$ex->publish('message2', 'routing.two');

$q1->consume();
$q2->consume(function (AMQPEnvelope $envelope, AMQPQueue $queue) {
    echo $envelope->getBody(), " ", $queue->getName(), PHP_EOL;
});
```

Which show us  (meta-code, 

```
message1 queue-two
message2 queue-two
```

Literally, it is not a problem, while under the hood both queues should operates on the same channel, so acking or nacking will works as expected.

Also, there are a lot similar potential pitfalls with this extension, so until pros weights more than cons we can allow ourselves such fixes. 


PS:

Alternatively, user may invoke `AMQPQueue::consumer()` on the same queue multiple time which may lead to problem to cancel all consumers except last one if consumer tag was generated on random bases (default behavior). But as of now I prefer not to dive into defensive programming.

Fixed.