Explicitly add category information to all posts.

_posts/meta/2008-11-24-a-new-hope.html

@@ -1,4 +1,5 @@
 ---
+category: meta
 layout: post
 title: A New Hope
 date: '2008-11-24T17:23:00.000-05:00'

_posts/meta/2011-05-24-clearing-out-cobwebs.html

@@ -1,4 +1,5 @@
 ---
+category: meta
 layout: post
 title: Clearing out the cobwebs
 date: '2011-05-24T16:53:00.000-04:00'

_posts/meta/2011-12-08-the-direction-of-this-blog.html

@@ -1,4 +1,5 @@
 ---
+category: meta
 layout: post
 title: The Direction of this Blog
 date: '2011-12-08T09:00:00.000-05:00'

_posts/meta/2013-10-22-this-blog-has-moved.html

@@ -1,4 +1,5 @@
 ---
+category: meta
 layout: post
 title: You're in the right place
 date: '2013-10-22T11:27:00.001-04:00'