Added post-update script
Added post-update script

Please review first. I don't want to test changes that are not going pass the review.
tobiasd/friendica,annando/friendica,tobiasd/friendica,fabrixxm/friendica,fabrixxm/friendica,friendica/friendica,tobiasd/friendica,annando/friendica,friendica/friendica,annando/friendica,tobiasd/friendica,friendica/friendica,tobiasd/friendica,annando/friendica,friendica/friendica,fabrixxm/friendica,fabrixxm/friendica,annando/friendica,fabrixxm/friendica,friendica/friendica