Marshmallow

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Features:

- Make context available to ``Nested`` field's ``on_bind_field`` method (:issue:`408`). Thanks :user:`immerrr` for the PR.
- Pass through user ``ValidationError`` kwargs (:issue:`418`). Thanks :user:`russelldavies` for helping implement this.

Other changes:

- Remove unused attributes ``root``, ``parent``, and ``name`` from ``SchemaABC`` (:issue:`410`). Thanks :user:`Tim-Erwin` for the PR.

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Bug fixes:

- Respect ``load_from`` when reporting errors for nested required fields (:issue:`414`). Thanks :user:`yumike`.

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Features:

- Add ``partial`` argument to ``Schema.validate`` (:issue:`379`). Thanks :user:`tdevelioglu` for the PR.
- Add ``equal`` argument to ``validate.Length``. Thanks :user:`daniloakamine`.
- Collect all validation errors for each item deserialized by a ``List`` field (:issue:`345`). Thanks :user:`maximkulkin` for the report and the PR.

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Features:

- Allow a tuple of field names to be passed as the ``partial`` argument to ``Schema.load`` (:issue:`369`). Thanks :user:`tdevelioglu` for the PR.
- Add ``schemes`` argument to ``validate.URL`` (:issue:`356`).

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Bug fixes:

- Prevent duplicate error messages when validating nested collections (:issue:`360`). Thanks :user:`alexmorken` for the catch and patch.

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Bug fixes:

- Serializing an iterator will not drop the first item (:issue:`343`, :issue:`353`). Thanks :user:`jmcarp` for the patch. Thanks :user:`edgarallang` and :user:`jmcarp` for reporting.