use reversible migration syntax

db/migrate/20120115192726_picture_has_photo_file.rb

@@ -1,8 +1,5 @@
 class PictureHasPhotoFile < ActiveRecord::Migration
-  def up
+  def change
     add_column :pictures, :photo_file, :string
   end
-
-  def down
-  end
 end

db/migrate/20120129191215_pictures_on_lists_are_ordered.rb

@@ -1,9 +1,5 @@
 class PicturesOnListsAreOrdered < ActiveRecord::Migration
-  def up
+  def change
     add_column :listed_pictures, :position, :integer
   end
-
-  def down
-    remove_column :listed_pictures, :position
-  end
 end

db/migrate/20120129212446_store_facebook_id.rb

@@ -1,9 +1,5 @@
 class StoreFacebookId < ActiveRecord::Migration
-  def up
+  def change
     add_column :users, :facebook_id, :integer
   end
-
-  def down
-    remove_column :users, :facebook_id
-  end
 end