ZF-6160: Zend_Application should have a autoloaderOptions key

Description

Zend_Application should be able to configure the autoloader.

Comments

Currently, it allows you to pass an array of autoloader namespaces (via the 'autoloaderNamespaces' key). If you need more customization than that, it is recommended to either pull the autoloader from Zend_Application prior to calling bootstrap(), or to configure the autoloader prior to initializing Zend_Application.