Fix for DocPad v6.28's deprecation of toShortDateString

Author: balupton

src/documents/pages/posts.html.jade

@@ -7,6 +7,6 @@ pageOrder: 2
 nav.linklist
   each doc in getCollection('posts').toJSON()
     li
-      span= doc.date.toShortDateString()
+      span= doc.date.toDateString()
       |  » 
       a(href=doc.url)= doc.title