Added failing tests for deleteRecord on embedded object.

Delete embedded record should dirty entire tree.
   
This points out the fact that a deleteRecord on an embedded relationship doesnt dirty the tree and though, doesnt throw a POST request for the parent object.

Issue #606 points out that deleterecord does not update manyarray.

Note that I merged #633 PR from @sandstrom on my branch to add a new test on its **embedded_saving_test** file.