Add controller plugin to ease job creation
Fix CS issue
Add exception for missing queue
Start test for queue
Add php doc for queue plugin manager
Fix test to push job into queue
Rename s/Queue/QueuePlugin for controller plugin

As per @bakura10 his request, rename the plugin to make it more clear.
Remove internal getters/setters

Directly access internal properties instead of using the provided
accessors.
Add documentation about controller plugin

Explain usage of the controller plugin, how to push jobs, push
multiple jobs and push jobs into different queues.
Add controller plugin to Changelog
Merge pull request #61 from juriansluiman/feature/controller-plugin

Ease creation of jobs with controller plugin