New foodcoop configuration option. Use own mailinglist instead of messaging system.

config/app_config.yml.SAMPLE

@@ -21,14 +21,15 @@ development: &defaults
   price_markup: 2.0
   # email address to be used as sender
   email_sender: foodsoft@myfoodcoop.org
-
-# Config for the exception_notification plugin
+  # If your foodcoop uses a mailing list instead of internal messaging system
+  #mailing_list: list@myfoodcoop.org
+  #mailing_list_subscribe: list-subscribe@myfoodcoop.org
+  # Config for the exception_notification plugin
   notification:
     error_recipients:
       - admin@myfoodcoop.org
     sender_address: "\"FoodSoft Error\" <foodsoft@myfoodcoop.org>"
     email_prefix: "[FoodSoft]"
-
   # Access to sharedLists, the external article-database
   shared_lists:
     adapter: mysql
@@ -38,7 +39,6 @@ development: &defaults
     password:
     encoding: utf8
     socket: /opt/lampp/var/mysql/mysql.sock
-
   # auto-units-conversion
   # this is used for automatic article-synchronization to handle different units
   # e.g. when foodcoop-unit should be 500g and supplier-unit is 1kg