Marshmallow-mongoengine

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- Drop support for Python 2.7
- Fix requirement on marshmallow (version 3 is not supported)

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- Add support for mongoengine.LazyReferenceField and mongoengine.GenericLazyReferenceField

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- Correct error on release

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- Add support for `toastedmarshamallow <https://pypi.python.org/pypi/toastedmarshmallow>`_
BREAKING CHANGE: marshmallow is no more installed by default, should use
``pip install marshmallow_mongoengine[marshmallow]`` or ``pip install marshmallow_mongoengine[toasted]``
depending of your favorite implementation.
- ``HISTORY.rst`` file introduced