change the url to something that actually does something and doesn't 404
Merge branch 'master' of https://github.com/concrete5/concrete5-5.7.0 into make-facebook-attach-work

Conflicts:
	web/concrete/authentication/facebook/hook.php
resolve merge conflict
Merge pull request #1109 from Mnkras/make-facebook-attach-work

change facebook url to something that actually does something and doesn't 404