adding ver 3.9.2
add 4.0.1 from http://plugins.svn.wordpress.org/xml-sitemap-feed/tags/4.0.1/
add 4.1.4 from http://plugins.svn.wordpress.org/xml-sitemap-feed/trunk/
add 4.2.1 from http://plugins.svn.wordpress.org/xml-sitemap-feed/trunk/
add 4.3.2 from http://plugins.svn.wordpress.org/xml-sitemap-feed/tags/4.2.3/