Add Support to RPC and Priority

Merge pull request #26 from ingresse/feature/priority-support

add support to send messages with priority and to RPC calls

Exchange configuration

The SDK now supports exchange configuration, like the following:

// ...
'queue.exchanges' => [
    'exchange.test' => [                
        'type' => 'fanout'
        'passive' => false,
        'durable' => true,
        'auto_delete' => false,
        'internal' => false,
        'nowait' => false,
        'arguments' => false,
        'ticket' => false,
        'delivery_mode' => 2
    ]
],
// ...

And then, setting in the Publisher

use MessageQueuePHP\Publisher\Publisher;

$myPublisher = new Publisher($amqpAdapter, 'worker.test', 'exchange.test');

Added array with queues config to factory

1.6.3

Added array with queues config to factory (#25)

Change adapter factory method to create

Change adapter factory method to create (#24)

Change method name from construct to create to be called external

Adjust for AMQP Config for right namespace

Update dependency monolog version

1.6.1

Updated monolog version (#23)

Factory to create the adapter

1.6

Add a factory to create the adapter (#22)

Update predis version again. To try to solver dependency problems

1.5

Update predis version (#15)

Check config for log adapter

Check config in Logger Adapter (#14)

* Check config in Logger Adapter

 - Its was implemented a way to check if the needed variables was setted
   in the moment when LoggerAdapter was instanced and if not
   throws an exception

Fixing missing lib in composer file.

Add missing dependecy in composer file.

 - Adding predis/predis 1.0.*

Logger Adapter

Transforming QueueLogger to implement AdapterInterface to provide fallback when need it.