Marshmallow-jsonapi

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Bug fixes:

* Format correction for error objects (:issue:`47`). Thanks :user:`ZeeD26` for the PR.

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Features:

* Correctly format ``messages`` attribute of ``ValidationError`` raised when ``type`` key is missing in input (:issue:`43`). Thanks :user:`ZeeD26` for the catch and patch.
* JSON pointers for error objects for relationships will point to the ``data`` key (:issue:`41`). Thanks :user:`cmanallen` for the PR.

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Features:

* ``Relationship`` deserialization improvements: properly validate to-one and to-many relatinoships and validate the presense of the ``data`` key (:issue:`37`). Thanks :user:`cmanallen` for the PR.
* ``attributes`` is no longer a required key in the ``data`` object (:issue:`39`, :issue:`42`). Thanks :user:`ZeeD26` for reporting and :user:`cmanallen` for the PR.
* Added ``id`` serialization (:issue:`39`). Thanks again :user:`cmanallen`.

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Features:

* Add relationship deserialization (:issue:`15`).
* Allow serialization of foreign key attributes (:issue:`32`).
* Relationship IDs serialize to strings, as is required by JSON-API (:issue:`31`).
* ``Relationship`` field respects ``dump_to`` parameter (:issue:`33`).

Thanks :user:`cmanallen` for all of these changes.

Other changes:

* The minimum supported marshmallow version is 2.3.0.

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Bug fixes:

* Relationship names are inflected when appropriate (:issue:`22`). Thanks :user:`angelosarto` for reporting.

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Bug fixes:

* Fix serializing null and empty relationships with ``flask.Relationship`` (:issue:`24`). Thanks :user:`floqqi` for the catch and patch.