Centralise generator generation, move theme generator generation to wp-head hook. Fixes #5085, #4803. props docwhat, Viper007Bond.

git-svn-id: https://develop.svn.wordpress.org/trunk@6195 602fd350-edb4-49c9-b593-d223f7449a82

wp-includes/feed-rss2.php

@@ -5,7 +5,6 @@ $more = 1;
 ?>
 <?php echo '<?xml version="1.0" encoding="'.get_option('blog_charset').'"?'.'>'; ?>
 
-<!-- generator="wordpress/<?php bloginfo_rss('version') ?>" -->
 <rss version="2.0"
 	xmlns:content="http://purl.org/rss/1.0/modules/content/"
 	xmlns:wfw="http://wellformedweb.org/CommentAPI/"
@@ -18,7 +17,7 @@ $more = 1;
 	<link><?php bloginfo_rss('url') ?></link>
 	<description><?php bloginfo_rss("description") ?></description>
 	<pubDate><?php echo mysql2date('D, d M Y H:i:s +0000', get_lastpostmodified('GMT'), false); ?></pubDate>
-	<generator>http://wordpress.org/?v=<?php bloginfo_rss('version'); ?></generator>
+	<?php the_generator( 'rss2' ); ?>
 	<language><?php echo get_option('rss_language'); ?></language>
 	<?php do_action('rss2_head'); ?>
 	<?php while( have_posts()) : the_post(); ?>