Django-auth-ldap

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- Better cache key sanitizing.

- Improved handling of LDAPError. A case existed where the error would not get
caught while loading group permissions.

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- Improved documentation for finding the official repository and contributing.

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- Under search/bind mode, the user's DN will now be cached for
performance.

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- Support selective group mirroring with :setting:`AUTH_LDAP_MIRROR_GROUPS` and
:setting:`AUTH_LDAP_MIRROR_GROUPS_EXCEPT`.

- Work around Django 1.11 bug with multiple authentication backends.

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- Support for complex group queries via
:class:`~django_auth_ldap.config.LDAPGroupQuery`.

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- Some more descriptive object representations.

- Improved tox.ini organization.