Fixed Django 1.9 deprecation warnings.#39

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Dmitri-Sintsov wants to merge 3 commits intoOskarPersson:masterfrom Dmitri-Sintsov:master

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Commits on Jul 28, 2015

Fixed Django 1.9 deprecation warnings. Small fixes in NestedInline.get_formsets().
Dmitri-Sintsov
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Commits on Aug 6, 2015

Support formset add/remove client-side events as in django/django#4883
Dmitri-Sintsov
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Bumped up version because it has some new functionality.
Dmitri-Sintsov
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