added login and acls

uffd/__init__.py

uffd/default_config.cfg

uffd/group/views.py

uffd/ldap/__init__.py

uffd/ldap/ldap.py

uffd/selfservice/__init__.py

uffd/selfservice/models.py

uffd/selfservice/templates/self.html

uffd/selfservice/views.py

uffd/session/__init__.py

uffd/session/models.py

uffd/session/templates/login.html

uffd/session/views.py

uffd/static/chaosknoten.png

uffd/user/views.py