ZF-8144: Add support for categories in Zend_Feed_Reader

Description

A getCategories method on Zend_Feed_Reader_FeedInterface and Zend_Feed_Reader_EntryInterface would be very useful. A cursory glance shows that both Atom and RSS support categories.

Comments

Support for both Feed and Entry level categories (via getCategories()) added to trunk. Will be formally released in 1.10 since it's new to the API.

Someone owes me a beer ;).