PrimaryKeyRelatedField with OneToOneField serializes wrong object's id

Refs #702.

List deserialization

For work on handling errors when deserializing lists of objects.

Merge branch 'master' of https://github.com/bitmonkey/django-rest-framework into list-deserialization

Fixes #705.

GenericAPIView now applies filter_backend for list and retrieve api views

Before this commit only the MultipleObjectAPIView would apply a
filter_backend, leaving the SingleObjectAPIView to return objects you
might otherwise expect to have been filtered out.

It's worth mentioning that when a SingleObjectAPIView makes a request
for an object that should be excluded, a 404 is the expected result.

index of bad item in data plus usual errors dict

Refs #707.

Fixed DateField with Empty Values (Fixes #707)

Patched DateField and DateTimeField to check for None values before trying to perform date(time) conversion.

Signed-off-by: Kevin Stone <kevinastone@gmail.com>

Signed-off-by: Kevin Stone <kevinastone@gmail.com>

Prevent warning: no files found matching '*.txt' under directory

'rest_framework/templates' (there are only .html files in the templates
directory).

Datetime formats