Support for ZF 2.3.*

[ZF 2.3.0](http://framework.zend.com/blog/zend-framework-2-3-0-released.html) is using the new [TranslatorInterface](https://github.com/zendframework/zf2/blob/master/library/Zend/I18n/Translator/TranslatorInterface.php) in [TranslatorAwareInterface->setTranslator()](https://github.com/zendframework/zf2/blob/master/library/Zend/I18n/Translator/TranslatorAwareInterface.php#L23)

NOTE: This will break BC

Fixes #25 Fixes #55