Apispec

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Features:

- [apispec.core]: Maintain order in which methods are added to an
endpoint (:issue:`189`). Thanks :user:`lafrech`.

Other changes:

- [apispec.core]: `Path` no longer inherits from `dict` (:issue:`190`).
Thanks :user:`lafrech`.

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Features:

- [apispec.ext.marshmallow]: Respect ``data_key`` argument on fields
(in marshmallow 3). Thanks :user:`lafrech`.

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Features:

- [apispec.ext.bottle]: Allow `app` to be passed to `spec.add_path`
(:issue:`188`). Thanks :user:`dtaniwaki` for the PR.

Bug fixes:

- [apispec.ext.marshmallow]: Fix issue where "body" and "required" were
getting overwritten when passing a ``Schema`` to a parameter
(:issue:`168`, :issue:`184`).
Thanks :user:`dlopuch` and :user:`mathewmarcus` for reporting and
thanks :user:`mathewmarcus` for the PR.

+++++++++++++++++++

- [apispec.ext.marshmallow]: Use ``dump_to`` for name even if
``load_from`` does not match it (:issue:`178`). Thanks :user:`LeonAgmonNacht`
for reporting and thanks :user:`lafrech` for the fix.

+++++++++++++++++++

Features:

- [apispec.core]: Add ``Spec.to_yaml`` method for serializing to YAML
(:issue:`161`). Thanks :user:`jd`.

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Features:

- [apispec.core and apispec.ext.marshmallow]: Add limited support for
OpenAPI v3. Pass `openapi_version='3.0.0'` to `Spec` to use it
(:issue:`165`). Thanks :user:`Bangertm`.