Add the author to the item in an rss feed.

The author was missing from the generated rss feed's items.  This adds it
back, but only uses the name for now.

feed_test.go

@@ -57,6 +57,7 @@ var rssOutput = `<?xml version="1.0" encoding="UTF-8"?>
       <title>Limiting Concurrency in Go</title>
       <link>http://jmoiron.net/blog/limiting-concurrency-in-go/</link>
       <description>A discussion on controlled parallelism in golang</description>
+      <author>Jason Moiron</author>
       <pubDate>2013-01-16T21:52:35-05:00</pubDate>
     </item>
     <item>

rss.go

@@ -92,6 +92,9 @@ func newRssItem(i *Item) *RssItem {
 		Guid:        i.Id,
 		PubDate:     anyTimeFormat(time.RFC3339, i.Created, i.Updated),
 	}
+	if i.Author != nil {
+		item.Author = i.Author.Name
+	}
 	return item
 }