Removed annoate and hirb Gemfiles.

Annotate: Better look in schema.rb, this reference should be always up
to date.

Hirb: To reactivate hirb, look in railscasts:
http://railscasts.com/episodes/48-console-tricks-revised

app/models/stock_change.rb

@@ -16,16 +16,3 @@ class StockChange < ActiveRecord::Base
   end
 end
 
-# == Schema Information
-#
-# Table name: stock_changes
-#
-#  id               :integer(4)      not null, primary key
-#  delivery_id      :integer(4)
-#  order_id         :integer(4)
-#  stock_article_id :integer(4)
-#  quantity         :integer(4)      default(0)
-#  created_at       :datetime
-#  stock_taking_id  :integer(4)
-#
-