finish and readd mailer

plugins/automatic_invoices/app/overrides/mailers/mailer_override.rb

@@ -1,6 +1,11 @@
 if FoodsoftAutomaticInvoices.enabled?
   Mailer.class_eval do
     # Sends automatically generated invoicesfor group orders to ordergroup members
+    def add_group_order_invoice_attachments(group_order_invoice)
+      attachment_name = group_order_invoice.name + '.pdf'
+      attachments[attachment_name] = GroupOrderInvoicePdf.new(group_order_invoice.load_data_for_invoice).to_pdf
+    end
+
     def group_order_invoice(group_order_invoice, user)
       @user = user
       @group_order_invoice = group_order_invoice