Djangorestframework-gis

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- `63 <https://github.com/openwisp/django-rest-framework-gis/issues/63>`_: added compatibility with python 3.2 and updated compatibility table in README
- `60 <https://github.com/openwisp/django-rest-framework-gis/pull/60>`_: ensure GeoJSON is rendered correctly in browsable API when using python 2
- `62 <https://github.com/openwisp/django-rest-framework-gis/issues/62>`_: updated django-rest-framework requirement to 3.1.3

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- `55 <https://github.com/openwisp/django-rest-framework-gis/pull/55>`_: Fixed exception in ``DistanceToPointFilter`` in case of invalid point
- `58 <https://github.com/openwisp/django-rest-framework-gis/pull/58>`_: Fixed handling of ``None`` values in ``GeoFeatureModelSerializer`` to avoid problems with ``FileField`` and ``ImageField``
- `57 <https://github.com/openwisp/django-rest-framework-gis/pull/57>`_: Added support for GeoJSON Bounding Boxes in ``GeoFeatureModelSerializer``

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- `53 <https://github.com/openwisp/django-rest-framework-gis/pull/53>`_: Added support for PATCH requests in ``GeoFeatureModelSerializer``

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- Added compatibility with django-rest-framework 3.1.x
- Added compatibility with django 1.8 (RC1)

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- Added compatibility with django-rest-framework 3.x

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- upgraded development status classifer to Beta
- avoid empty string in textarea widget if value is None
- allow field definition in GeoFeatureModelSerializer to be list