Apispec

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Features:

- [apispec.core]: Definition helper functions receive the ``definition`` keyword argument, which is the current state of the definition (:issue:`122`). Thanks :user:`martinlatrille` for the PR.

Other changes:

- [apispec.ext.marshmallow] *Backwards-incompatible*: Remove ``dump`` parameter from ``schema2parameters``, ``fields2parameters``, and ``field2parameter`` (:issue:`114`). Thanks :user:`lafrech` and :user:`frol` for the feedback and :user:`lafrech` for the PR.

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Features:

- [apispec.core]: Add ``extra_fields`` parameter to `APISpec.definition` (:issue:`110`). Thanks :user:`lafrech` for the PR.
- [apispec.ext.marshmallow]: Preserve the order of ``choices`` (:issue:`113`). Thanks :user:`frol` for the PR.

Bug fixes:

- [apispec.ext.marshmallow]: 'discriminator' is no longer valid as field metadata. It should be defined by passing ``extra_fields={'discriminator': '...'}`` to `APISpec.definition`. Thanks for reporting, :user:`lafrech`.
- [apispec.ext.marshmallow]: Allow additional properties when translating ``Nested`` fields using ``allOf`` (:issue:`108`). Thanks :user:`lafrech` for the suggestion and the PR.
- [apispec.ext.marshmallow]: Respect ``dump_only`` and ``load_only`` specified in ``class Meta`` (:issue:`84`). Thanks :user:`lafrech` for the fix.

Other changes:

- Drop support for Python 3.3.

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Features:

- [apispec.ext.marshmallow]: Translate ``allow_none`` on ``Fields`` to ``x-nullable`` (:issue:`66`). Thanks :user:`lafrech`.

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Bug fixes:

- [apispec.ext.marshmallow]: Fix corruption of ``Schema._declared_fields`` when serializing an APISpec (:issue:`107`). Thanks :user:`serebrov` for the catch and patch.

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Bug fixes:

- [apispec.ext.marshmallow]: Fix behavior when passing `Schema` instances to `APISpec.definition`. The `Schema's` class will correctly be registered as a an available `ref` (:issue:`84`). Thanks :user:`lafrech` for reporting and for the PR.

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Bug fixes:

- [apispec.ext.tornado]: Remove usage of ``inspect.getargspec`` for Python >= 3.3 (:issue:`102`). Thanks :user:`matijabesednik`.