Add Zend\EventManager\ProvidesEvents trait
Add Zend\EventManager\ProvidesEvents trait

- Cannot use in core until 3.0
- Comments added to classes that could use it

ezimuel/zend-mvc,svycka/zend-mvc,turrsis/zend-mvc,svycka/zend-mvc,turrsis/zend-mvc,ezimuel/zend-mvc,MadCat34/zend-mvc,MadCat34/zend-mvc