Ability to take down server from www-interface.

[Former user]

We should be able to take down the PI from the www-interface so people sont just plug the power instead.

If the www-service does not have proper permissions we could add some stuff to /etc/sudoers

[Jimmy E]

Reported by me.

[Marcus Karlsson]

Submitted a pull response which implements the requested functionality. https://bitbucket.org/davka003/automagically/pull-request/9/added-reboot-and-shutdown-option-both-as/diff