Cleaning

This PR contains several cleaning and update the code to my latest changes in SlmQueue 0.3.

As you can see, I've added a practical way to use "queues" key to configure queues. when https://github.com/juriansluiman/SlmQueue/pull/64 is merged, you will be able to do this:

```php
return [
		'slm_queue' => [
			'options' => [
				'queues' => [
					'configurable-key' => [
						'priority' => 10,
						'ttr'=> 15
					]
				]
			]
		]
	]
```

You can therefore configure each queue separately!