fix function names and dotted lookups for use in PrimaryKeyRelatedField.field_to_native (they work in RelatedField.field_to_native already)
Allow for missing non-required nested objects.

Serializer fields which are themselves serializers should not be required.
Specifically, if a nested object is set to "required=False", it should be
possible to serialize the main object and have the sub-object set to None/null.
Merge remote-tracking branch 'upstream/master'
Updated the dependencies version and added the ALLOWED_HOSTS for tests.
add tests for related field source for RelatedField and PrimaryKeyRelatedField. #694
add tests for related field source for HyperlinkedRelatedField. #694
serializers.Field respects ordering on dicts if it exists.  Closes #832
add tests for dotted lookup in RelatedField, PrimaryKeyRelatedField, and HyperlinkedRelatedField. #694
Merge pull request #694 from craigds/master

fix function names and dotted lookups for use in PrimaryKeyRelatedField
A model's field is required if is null or blank
Merge pull request #851 from linovia/master

Updated the dependencies version and added the ALLOWED_HOSTS for tests.
Adding `BLANK_CHOICE_DASH` as a choice if the model's field isn't required
Merge branch 'master' into 725-blank-choice-dash

Conflicts:
	rest_framework/tests/fields.py
Moved test model into closer to the testcase
Merge pull request #853 from pyriku/725-blank-choice-dash

Adds BLANK_CHOICE_DASH as a choice item
Merge pull request #831 from brianz/master

Allow nested fields to be missing
Added @craigds, @pyriku, @brianz - Yay for sprints!
Initial commit of fix for https://github.com/tomchristie/django-rest-framework/issues/775
ToMany fields default to read-only if targeting ManyToManyField.
Merge branch 'master' of git://github.com/tomchristie/django-rest-framework