add test case around ensuring proper field inference for boolean model field types
This fix results in models.NullBooleanField rendering as a checkbox in the browsable API
reworked APIException, pushing some of the status_code and detail management up.  Also, makes the APIException useful in isolation (defaults to status code 500)
Improve handling of 'empty' values for ChoiceField

The empty value defaults back to '' (for backwards-compatibility) but
is changed automatically to None for ModelSerializers if the `null`
property is set on the db field.
Drop u'' prefix for python 3.x compatibility
Merge pull request #1214 from diox/choicefield-typed

Improve handling of 'empty' values for ChoiceField
Updated versions in tox and travis config
Fixed a regression with ValidationError under Django 1.6
Fix object creation with reverse M2M when related_name unspecified

It seems that field.related_query_name() does not return the related_name
for reverse M2M relations when related_name is not explicitly set in the M2M field
definition.

So, change to use obj.get_accessor_name(), where obj is an instance of
RelatedObject, as are returned by a model's
_meta.get_all_related_many_to_many_objects(), or as in the tuples returned by
_meta.get_all_m2m_objects_with_model().
Merge pull request #1216 from linovia/master

Fixed a regression with ValidationError under Django 1.6
Merge remote-tracking branch 'upstream/master' into versions
Exclude 1.4 on python 3
Merge pull request #1215 from brutasse/versions

Updated versions in tox and travis config
Merge pull request #1217 from benpbenp/master

Fix object creation with reverse M2M when related_name unspecified
Typo on api-guide/fields.md and serializers.py
Merge pull request #1219 from sepeth/fix-documentation-typo

Typo on api-guide/fields.md and serializers.py
Added drf-ujson-renderer to renderers docs

drf-ujson-renderer is a third party renderer that implements JSON renderering using UltraJSON
Merge pull request #1220 from hzy/patch-1

Added drf-ujson-renderer to renderers docs
Add queryset aggregates to allowed fields in OrderingFilter
Merge branch 'master' into allow-aggregate-ordering