Group-emails are also allowed to contain dashes.
Group-emails are also allowed to contain dashes.
Merge remote-tracking branch 'upstream/master'
Merge branch 'master' of https://github.com/NicoleRauch/NeuePlattform-Implementierung

Conflicts:
	public/clientscripts/check-groupform.js
Merge pull request #184 from NicoleRauch/master

Die Mailadressen von Gruppen dürfen auch Bindestriche enthalten.