description field

git-svn-id: https://plugins.svn.wordpress.org/add-art/trunk@1027410 b8457f37-d9ea-0310-8a92-e5e31aec5664
description added to rss

git-svn-id: https://plugins.svn.wordpress.org/add-art/trunk@1027412 b8457f37-d9ea-0310-8a92-e5e31aec5664