ZF-3783: SubControllers in default module create invalid helper prefix
Currently, when using sub controllers in the default module, a helper path based on the leading path segment is created, instead of using the default. For example:
application/ controllers/ Admin/ FooController.php views/ helpers/ SomeHelper.php
application/views/helpers/SomeHelper.php would contain the class Zend_View_Helper_SomeHelper. If an action in Admin_FooController is invoked and the view calls the someHelper() helper, it will attempt to resolve it to Admin_View_Helper_SomeHelper and not find it.