PATCH fails when mixing in Restagular object onto another one

Steps:
- Mix in a Restangularized object coming from a GET request into another object.
- Update some fields.
- Use the patch method that has been mixed into the object.

Result: The PATCH uploads the original data that was downloaded in the get.
Plunker test: http://plnkr.co/edit/67IXsgnpil7sORCXDNKa?p=preview
