Drf-compound-fields

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* Deprecate Python 2 support
* Fix 29

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* Upgrade ListOrItemField and PartialDictField for django-rest-framework 3.0 and beyond
* Remove ListField and DictField, as they now come with django-rest-framework

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Correct validation behaviors when fields are used in embedded serializers. Also correction to the
`list` and `dict` type checks for `None` values (15, 16, 18).

* Implement `initialize` and `field_from_native` to ensure proper validation in embedded
serializers.
* Give the fields distinct `validate` and `run_validators` implementations that don't call each
other.
* Don't apply the `list` and `dict` type checks for `None` values.

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Loosen dependency versions

* Remove explicit dependency on Django
* Loosen rest-framework to any version before 3

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* Documentation (3)
* Collect messages of nested errors, instead of error objects (12)
* Add ListOrItemField type (5, 11)
* Fix PartialDictField validation and handling of badly-typed values
* Switch project tests to py.test (10)

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First PyPI release of rest-framework serializer compound-fields (1). Provides:

* ListField (4, 7)
* DictField
* PartialDictField (8, 9)