BUG: Got rid of deprecation errors, add extensions.yml and routes.yml for SS3 compatibility
Pick up update from  sheadawson / silverstripe-securefiles
Further updates for ss3 to SecureFileGroupPermissionDecorator.php
Further SS3 Updates. Use ListBoxField for Member selection instead of GF. GF was not working and was possibly overkill anyway. Removed Group settings header
Update for 3.1
Add url_handler
Add other decorators
use 'index' rather than 'handleAction'.
Add field to tab for better spacing.
Move config into single yaml file.
fix typo