removed special offer id from items

front-api/db/migrate/20150321052318_create_delivery_time_estimations.rb

@@ -0,0 +1,10 @@
+class CreateDeliveryTimeEstimations < ActiveRecord::Migration
+  def change
+    create_table :delivery_time_estimations do |t|
+      t.string :name
+      t.integer :duration_in_days
+
+      t.timestamps null: false
+    end
+  end
+end