Use dc:creator instead of author for the author's name

Unfortunately the braindead RSS speciifcation requires author to
be an email address, so we have to use Dublin Core metadata to
report the author name instead.

app/views/notes/feed.rss.builder

@@ -1,6 +1,7 @@
 xml.instruct!
 
 xml.rss("version" => "2.0", 
+        "xmlns:dc" => "http://purl.org/dc/elements/1.1/",
         "xmlns:geo" => "http://www.w3.org/2003/01/geo/wgs84_pos#",
         "xmlns:georss" => "http://www.georss.org/georss") do
   xml.channel do
@@ -30,7 +31,7 @@ xml.rss("version" => "2.0",
         end
 
         if comment.author
-          xml.author comment.author.display_name
+          xml.dc :creator, comment.author.display_name
         end
 
         xml.pubDate comment.created_at.to_s(:rfc822)