FIX: proper exit status code for backup/restore scripts

lib/import/importer.rb

@@ -5,6 +5,8 @@ module Import
 
   class Importer
 
+    attr_reader :success
+
     def initialize(user_id, filename, publish_to_message_bus = false)
       @user_id, @filename, @publish_to_message_bus = user_id, filename, publish_to_message_bus