add favicon

_includes/head.html

@@ -6,6 +6,7 @@
   <title>{% if page.title %}{{ page.title }}{% else %}{{ site.title }}{% endif %}</title>
   <meta name="description" content="{% if page.excerpt %}{{ page.excerpt | strip_html | strip_newlines | truncate: 160 }}{% else %}{{ site.description }}{% endif %}">
 
+  <link rel="shortcut icon" href="images/favicon.png"/>
   <link rel="stylesheet" href="/css/normalize.css">
   <link rel="stylesheet" href="/css/skeleton.css">
   <link rel="stylesheet" href="{{ "/css/main.css" | prepend: site.baseurl }}">