-------------------
- Performance improvements to group mirroring (from
`Denver Janke <https://bitbucket.org/denverjanke>`_).
- Add :data:`django_auth_ldap.backend.ldap_error` signal for custom handling of
:exc:`~ldap.LDAPError` exceptions.
- Add :data:`django_auth_ldap.backend.LDAPBackend.default_settings` for
per-subclass default settings.