Add nested create for 1to1 reverse relationships
Remove commented out debug code
Update one-to-one test names
Update errant test comment
Add one-to-one nested update and delete functionality
Move nested serializer logic into .field_from_native()
Use None to delete nested object as opposed to _delete flag
Merge pull request #556 from maspwr/one-to-one-nested

One-to-one writable, nested serializer support