Triaged
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http://bugs.python.org/issue28563 - Arbitrary code execution in gettext.c2py (debugging a backwards-incompatbility that broke some Django tests)
https://code.djangoproject.com/ticket/27492 - JsonResponse can't handle model_to_dict() with empty ImageField (invalid)
https://code.djangoproject.com/ticket/27487 - ModelAdmin.formfield_overrides on ManyToManyField isn't compatible with CheckboxSelectMultiple (accepted)
https://code.djangoproject.com/ticket/27480 - Add a Cache.touch(key, timeout=DEFAULT_TIMEOUT) method (accepted)
https://code.djangoproject.com/ticket/27496 - Iterating over ModelChoiceField with RadioSelect widget duplicates query (duplicate)
Reviewed/committed
------------------
https://github.com/django/django/pull/7545 - Fixed #27463 -- Fixed E741 flake8 warnings.
https://github.com/django/django/pull/7521 - Fixed #27453 -- Avoided unnecessary recompilation of non-translated URL regexes.
https://github.com/django/django/pull/7557 - Fixed #27407 -- Made Model.delete(keep_parents=True) preserve parent reverse relationships.
https://github.com/django/django/pull/7443 - Fixed #27394 -- Added scientific notation support for big integer in floatformat filter.
https://github.com/django/django/pull/7438 - Fixed #27393 -- Aligned input boxes in admin password reset forms.
https://github.com/django/django/pull/7012 - Fixed #27003 -- Fixed JSONField/SimpleArrayField crash on converted values.
https://github.com/django/django/pull/7562 - Fixed #27488 -- Added SpatiaLite support for IsValid, MakeValid, and __isvalid.
https://github.com/django/django/pull/7559 - Fixed #27482 -- Doc'd an example of Case() in QuerySet.filter().
https://github.com/django/django/pull/7569 - Fixed #27156 -- Made changing HttpRequest.encoding clear GET.