Dependency Injection
https://github.com/orno/di
http://framework.zend.com/manual/2.0/en/modules/zend.di.introduction.html
http://php-di.org/
(
https://github.com/mnapoli/PHP-DI
)
https://github.com/TomBZombie/Dice
https://github.com/auraphp/Aura.Di