Django-rds-db-multitenant

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- Fix packaging

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- Pylint
- Improve passing of arguments to logger in MySQL backend

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- Change API of mapper to pass tenant_name to get_db_name
- Add new Tests section in the documentation
- Rename dbname to db_name for consistency with tenant_name
- Fix bug from v2.0 on signature of get_cache_prefix

The API of the mapper has been modified to speed up parsing
and for consistency:

- ``get_dbname()`` has been renamed to ``get_db_name()``
- ``get_db_name()`` receives ``request`` and a new ``tenant_name`` argument
- ``get_cache_prefix()`` receives ``request`` and new ``tenant_name`` and
``db_name`` arguments

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- Fixed package name in setup.py

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- New PostgreSQL backend
- Improved documentation
- Examples of mappers are provided in the repository
- update_from_env arguments are now optional
- New setup.py based on Human's Ultimate Guide to setup.py
- Remove Python 2.6 support

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- Django 1.10 compatibility
(`8 <https://github.com/mik3y/django-db-multitenant/pull/8>`__)