Add support for models using default_scope

It's so simple AR create is enough.

> On 12 wrz 2014, at 10:49, Marcin Nowicki <notifications@github.com> wrote:
> 
> In spec/lib/synced/synchronizer_spec.rb:
> 
> > @@ -181,6 +192,21 @@
> >        rentals = Rental.synchronize(remote: remote_objects, scope: account)
> >        expect(rentals).to eq [Rental.find_by(synced_id: 42)]
> >      end
> > +
> > +    it "ignores the model default scope" do
> > +      rental = Rental.create
> Why not use factories here?
> 
> —
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