I'm the author, the package can be located here:
https://github.com/ahungry/injection
It allows dependency injection similar to what some other language frameworks (PHP Symfony/Laravel) offer, in that you can map out parameters/services at a top level configuration file.
Let me know if you have any questions (if you have time, the README gives a nice concise example of functionality, as it shows what the sample YAML file would look like).