Fix for Forward in zend-eventmanager v3
Fix for Forward in zend-eventmanager v3

Actually,

EventManager returns an ARRAY on `$sharedEvents->getListeners` and the way it was implemented the `listenersToDetach` it wasn't working. 
I don't know if in V2 it is the same thing, so, this pull request FIX this method and a problem from rendering the View two times.

Like this old bug: http://zend-framework-community.634137.n4.nabble.com/Double-rendering-with-forward-plugin-td4656067i20.html

Thanks,

Rodrigo
MadCat34/zend-mvc,turrsis/zend-mvc,turrsis/zend-mvc,MadCat34/zend-mvc