item groups now have order - start page is now item group 1 (configurable in globals)

front-api/models/item.rb

@@ -4,6 +4,9 @@ class Item < ActiveRecord::Base
   has_many :multi_media_descriptions
   belongs_to :sub_category
 
+  has_many :item_groups, through: :item_in_groups 
+
+
   attr_accessor :count # used for cart
   def attributes
     super.merge('count' => self.count)