adds a new user settings system + migration + rake task/worker updates

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended to check this file into your version control system.
 
-ActiveRecord::Schema.define(:version => 20121230142516) do
+ActiveRecord::Schema.define(:version => 20130605235825) do
 
   create_table "article_categories", :force => true do |t|
     t.string "name",        :default => "", :null => false
@@ -268,6 +268,17 @@ ActiveRecord::Schema.define(:version => 20121230142516) do
   add_index "pages", ["permalink"], :name => "index_pages_on_permalink"
   add_index "pages", ["title"], :name => "index_pages_on_title"
 
+  create_table "settings", :force => true do |t|
+    t.string   "var",                      :null => false
+    t.text     "value"
+    t.integer  "thing_id"
+    t.string   "thing_type", :limit => 30
+    t.datetime "created_at",               :null => false
+    t.datetime "updated_at",               :null => false
+  end
+
+  add_index "settings", ["thing_type", "thing_id", "var"], :name => "index_settings_on_thing_type_and_thing_id_and_var", :unique => true
+
   create_table "stock_changes", :force => true do |t|
     t.integer  "delivery_id"
     t.integer  "order_id"