WLURLTransformer.
Merge branch 'master' of github.com:wireload/Ratatosk
Fixed: crash reading plain old JS objects such as CGSize.

Ratatosk would send a CGSize just fine as a {"width": w, "height": h} JSON dictionary. But when receiving the exact same JSON, Ratatosk would crash if the model had a non nil value for the property.

This fix ensures equality tests of POJS don't crash in either direction.