Groups are added correctly to session information.
Users are granted different access rights based on their group memberships
Merge pull request #3 from lichtsprung/WIP_Session_Management

Add SessionManagement to LWM
Milestone implements:
* LDAP authentication
* User Roles match the ldap groups
Merge branch 'master' of https://github.com/FHK-ADV/lwm into log-bk
Added 'hanging' registration