Ease creation of jobs with controller plugin

We might make it easier for users to create a job and insert in into the queue from controllers. If you do not inject anything, these are the required steps:

```
class FooController extends AbstractActionController
{
    public function barAction()
    {
        $sl      = $this->getServiceLocator();
        $manager = $sl->get('SlmQueue\Queue\QueuePluginManager');
        $queue   = $manager->get('My-Queue');

        $manager = $sl->get('SlmQueue\Job\JobPluginManager');
        $job     = $manager->get('Foo\Job\BazJob');

        $queue->push($job);
    }
}
```

You need to inject the queue plugin manager and the job plugin manager to remove the service location pattern. I was now thinking something like:

```
class FooController extends AbstractActionController
{
    public function barAction()
    {
        $this->queue('My-Queue')->push('Foo\Job\BazJob');
    }
}
```

With above, the queue plugin is stateful, but it's imho the easiest to push multiple jobs. We can add a payload with a second argument: `push(<string> $name, $payload = null)`
I think the setQueue and getQueue method are useless here. They are doing nothing, so I'd suggest just using $this->queue