Django-cerberus-ac

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- Improve performance by getting conveyors/heirs iteratively instead of recursively
(database requests number drastically reduced).

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- Fix missing ``django-suit-dashboard`` in ``setup.py``.
- Fix usage of ``django-app-settings`` 0.3.0 in ``urls.py``.

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- Fix mapping setting for ``django-app-settings`` 0.3.0.

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- Update to support ``django-app-settings`` 0.3.0.

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- Fix ``save() prohibited to prevent data loss due to unsaved related object 'reference'`` error in admin ``save_model``.

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- Override ``save_models`` admin methods to add user in history records.
- Add and rename methods in ``RoleMixin``.
- Fix mapping setting check function.
- Implement implicit authorization.
- Add Science/Research classifier.
- Fix bug when id cannot be coerced to right type.
- Add migration 2.
- Improve ``RolePrivilege`` admin.
- Add drag and zoom to role hierarchy graph.
- Update initial migration to reflect code.