Log Message:
Update to 0.28:

0.28  2007.11.06
    * Fixed Namespace handling in extensions so that both URL and NS object work
      (Thanks to Brian Cassidy)

0.27_01 2007.10.04
    * Removes most of hacks to deal with LibXML insane unicode stuff which are \ 
fixed with 1.64

0.27 2007.09.15
    * Fixed $feed->as_xml_utf8 to work with latest XML::LibXML

0.26 2007.09.15
    * This be 0.26

0.25_02  2007.06.20
    * Fixed tests that fail with newer libxml (Thanks to knagano)

0.25_01 2007.04.27

    * Fixed XML::Atom::Base element accessor to work with attributes
      (Patch from LTjake and Jshirley for OpenSearch extension)
    * Make XML::Atom::Link easily subclassable
      (Patch from Simon Wistow for Google Calendar support)