Django-simple-elasticsearch

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* Fixing an issue with the recently released elasticsearch-py 6.0.0

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* Addressing inability to index models with a non-integer PK field (ie. `UUIDField`) - added ability to order bulk queryset on an arbitrary model field.

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* Allowing direct access (again) to underlying dict/list in `Result` and `Response` classes for serialization and other purposes.

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* Response class is now MutableSequence based, giving it the properties of a `list`. Its `results` attribute is deprecated, as you can now iterate over the results with the response instance itself.
* Result class `results_meta` is deprecated. Use `meta` instead.
* `get_from_es_or_None` now returns a `Result` object instead of the raw Elasticsearch result, for consistency.
* `get_from_es_or_None` now catches only the Elasticsearch `NotFoundError` exception; previously it caught the more expansive `ElasticsearchException`, which could hide unrelated errors/issues.

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* Result class is now MutableMapping based, giving it the properties of a `dict`. Its `data` attribute is deprecated.

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* Minor changes to enable support for elasticsearch-py 5.x.