Adding post details in preparation for the API importer code.

db/migrate/20131015131652_create_post_details.rb

@@ -0,0 +1,14 @@
+class CreatePostDetails < ActiveRecord::Migration
+  def change
+    create_table :post_details do |t|
+      t.belongs_to :post
+      t.string     :key
+      t.string     :value, size: 512
+      t.text       :extra
+
+      t.timestamps
+    end
+
+    add_index :post_details, [:post_id, :key], unique: true
+  end
+end