Add 'tagregator' class to the body element.

This is useful for themes that want to style elements on the page that contains the shortcode, but are outside of the shortcode container.

props ryelle


git-svn-id: https://plugins.svn.wordpress.org/tagregator/trunk@1005392 b8457f37-d9ea-0310-8a92-e5e31aec5664