v.2.1.3

* Added action: `send_user_authentication`; Notification informations as parameters
* Enhancement: `confirm-user-registration-notification-header` filter has user as arguement
* Enhancement: `confirm-user-registration-notification-subject` filter has user as arguement
* Enhancement: `confirm-user-registration-notification-message` filter has user as arguement

Signed-off-by: Ralf Hortt <me@horttcore.de>
Merge branch 'master' of https://github.com/Horttcore/confirm-user-registration

Conflicts:
	README.md
	readme.txt

Signed-off-by: Ralf Hortt <me@horttcore.de>