Django-flickr-gallery

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* fixed support to python 3.X
* fixed NoneTyped Error into photoset photos
* fixed performance to get photo list

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* implemented the Photo.getInfo method into base api to get photos into photoset

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* fixed cache settings
* solved warnings from django 1.9 and 1.10
* fixed settings from django 1.9 and 1.10

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* removed dependencies

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* fixed ``Photoset._get_photoset``

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* removed ``django_flickr_gallery.migrations_django``, the root migration is ``django_flicker_gallery.migrations`` now 12
* changed to ``from importlib import import_module`` 11
* changed photo list template to ``photo_list.html``
* fixed ``README.rst``
* fixed 404 error to ``Photoset._get_photoset``