Changing the use of config constants to the Rails configuration object

app/views/stream_entries/show.atom.ruby

@@ -1,9 +1,9 @@
 Nokogiri::XML::Builder.new do |xml|
   entry(xml, true) do
     author(xml) do
-      include_author xml, @entry.account
+      include_author xml, @stream_entry.account
     end
 
-    include_entry xml, @entry
+    include_entry xml, @stream_entry
   end
 end.to_xml