add /feed/; add .ignore/ to list of Jekyll excludes

_config.yml

@@ -1,6 +1,6 @@
 pygments: true
 markdown: maruku
-exclude: [deploy.sh]
+exclude: [deploy.sh,.ignore/]
 
 maruku:
   use_tex:    true

feed/index.xml

@@ -0,0 +1,27 @@
+---
+layout: nil
+---
+<?xml version="1.0" encoding="utf-8"?>
+<feed xmlns="http://www.w3.org/2005/Atom">
+
+ <title>David Hu</title>
+ <link href="http://david-hu.com/atom.xml" rel="self"/>
+ <link href="http://david-hu.com/"/>
+ <updated>{{ site.time | date_to_xmlschema }}</updated>
+ <id>http://david-hu.com/</id>
+ <author>
+   <name>David Hu</name>
+   <email>david@david-hu.com</email>
+ </author>
+
+ {% for post in site.posts %}
+ <entry>
+   <title>{{ post.title }}</title>
+   <link href="http://david-hu.com{{ post.url }}"/>
+   <updated>{{ post.date | date_to_xmlschema }}</updated>
+   <id>http://david-hu.com{{ post.id }}</id>
+   <content type="html">{{ post.content | xml_escape }}</content>
+ </entry>
+ {% endfor %}
+
+</feed>