fix delete() and add getQueue() methods

delete() must call parent delete() in order to properly mark the job deleted. getQueue() must be implemented since the inherited $queue which should be a string is being replaced by the AMQPQueue object. this should actually be changed to its own $amqp variable and $queue should always be a string
Merge pull request #2 from jowy/master

fix delete() and add getQueue() methods
using implemented $this->getQueue() instead of $this->queue->getName()
Merged with fintech-fab/master