Prefetch

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* Fixed a test assertion. Contributed by George Ma in `12 <https://github.com/ionelmc/django-prefetch/pull/12>`_.
* Added support for Django 1.9. Contributed by Will Stott in `14 <https://github.com/ionelmc/django-prefetch/pull/14>`_.
* Fixed use of deprecated `field.rel.to` momdel API (Django 1.9+).

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* Fixed manager type check. Contributed by George Ma in `11 <https://github.com/ionelmc/django-prefetch/issues/11>`_.

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* Fixed issues with ``select_related`` being removed when prefetch is used (`9 <https://github.com/ionelmc/django-prefetch/issues/9>`_).