Openwisp-users

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- upgraded django to 2.0 and django-allauth to 0.34.0

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- `c5b648e <https://github.com/openwisp/openwisp-users/commit/c5b648e>`_:
[mixins] Extracted logic of ``OrgMixin`` to ``ValidateOrgMixin``

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- `3 <https://github.com/openwisp/openwisp-users/issues/3>`_:
[admin] Allow operators to manage users without being
able to change superuser related details
- `31b13bb <https://github.com/openwisp/openwisp-users/commit/31b13bb>`_:
[requirements] Updated django-allauth to 0.33.0

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- `f49f900 <https://github.com/openwisp/openwisp-users/commit/f49f900>`_:
[admin] Removed view on site link in organization admin
- `2144b29 <https://github.com/openwisp/openwisp-users/commit/2144b29>`_:
[admin] Removed view on site link in organization user admin
- `dcef200 <https://github.com/openwisp/openwisp-users/commit/dcef200>`_:
[requirements] Updated django-allauth to 0.32.0

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- `f9056e9 <https://github.com/openwisp/openwisp-users/commit/f9056e9>`_:
[admin] Always require email
- `c21c782 <https://github.com/openwisp/openwisp-users/commit/c21c782>`_:
[mixins] Fixed bugged org pk comparison in ``_validate_org_relation``
- `763c261 <https://github.com/openwisp/openwisp-users/commit/763c261>`_:
[accounts] Added back frontend logout url
- `b93de81 <https://github.com/openwisp/openwisp-users/commit/b93de81>`_:
[admin] Added back site model

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- `b615f4c <https://github.com/openwisp/openwisp-users/commit/b615f4c>`_:
[admin] Unregister ``allauth.socialaccount`` models
- `d6a2294 <https://github.com/openwisp/openwisp-users/commit/d6a2294>`_:
[allauth] Added proxy URLs for ``allauth.acounts``