ZF3, EventManager 3 support

[Saeven]

This PR solves the event manager crisis caused by the changes to ZF3's SM. :)

Hooray! ZF3!

[tylkomat]

There are more open problems to make it running under ZF3.

The Initializers and Factories have not been updated to the new signatures. Also to make the console working one would need the package zendframework/zend-mvc-console, but with that package it is not compatible with ZF2. Another option would be to migrate to zfcampus/zf-console. That would make the console independent from zend-mvc package and backward compatible.

[widmogrod]

IMHO adapting signatures to ZF3 would be the best option. Then version of this project could be bumped to 2.0 and backward compatibility wouldn't be an issue, since anyone who needs previous version would use different version

@Saeven @tylkomat would you like/mind to continue work on ZF3?

[tylkomat]

@widmogrod I don't mind. I anyway have a work in progress already, but there I was thinking to port to zf-console, since I noticed that the mvc-console has some issues see here and here, which have the same reason I suppose.

Also one would need to implement updates for both versions.

[widmogrod]

@tylkomat sounds reasonable to use zf-console.