For a new activity with default resource, registration should be open initially. (This is the standard use case when creating a new activity.)
Merge pull request #566 from NicoleRauch/master

Die Standard-Ressource soll beim Anlegen einer Aktivität die Registrierung zulassen
removed non existing parameter
streamlining - replace this by self in sympaCache
small cleanup in groupsAPI subscription test
using lodash smarter API
(un)subscribing contact persons to admin list on group editing
Merge commit 'd3e8989b8cb86d5f98a11c463e74aad4baabad7c'
created new function for saving groups in the groupsAndMembersAPI
admin list subscriptions now in groups and members api