Update feed.xml to use proper site title. Fixes #3

Author: bradleytaunt

feed.xml

@@ -4,7 +4,7 @@ layout: none
 <?xml version="1.0" encoding="UTF-8"?>
 <rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">
   <channel>
-    <title>{{ site.name | xml_escape }}</title>
+    <title>{{ site.title | xml_escape }}</title>
     <description>{{ site.description | xml_escape }}</description>
     <link>{{ site.url }}</link>
     <atom:link href="{{ site.url }}/feed.xml" rel="self" type="application/rss+xml" />