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WARNING: **New major upstream release (backwards incompatible!).**
* Method ``include_dropzone()`` rename to ``load()``.
* Add a ``create()`` method to create dropzone form.
* Add a ``style()`` method to add style to upload area.
* Use ``action_view`` argument (in ``create()``) to set action url.
* Dropzonejs version increase to 5.1.1.
* PEP8 and bug fix.