Updated versions in tox and travis config
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
Bump version
Undo version bump
Merge pull request #1224 from alexjg/allow-aggregate-ordering

Allow aggregate ordering
Add Alex Good to credits (Whoop!)
Merge pull request #1226 from alexjg/master

Add Alex Good to credits (Whoop!)
Version 2.3.9
Version 2.3.9