Added support for iOS5. Handled GCD queues management and source timers. Fixed memory issues (queues and not released iVars).
[ARC] AMQPChannel is now ARC-based.
[ARC] AMQPConnection is now ARC-based.
[ARC] AMQPConsumer is now ARC-based.
[ARC] AMQPConsumerThread is now ARC-based. Removed useless lock queue.
[ARC] AMQPExchange and category are now ARC-based.
[ARC] AMQPMessage is now ARC-based.
[ARC] AMQPObject is now ARC-based.
[ARC] AMQPQueue is now ARC-based.
Used init CTX style.