API: Add 'object' to the response on Deletion

The goal is to be closer to Stripe API. Also, create a new DeletedObject class
that will be easier to use.

localstripe/resources.py

@@ -158,7 +158,7 @@ def _api_delete(cls, id):
         if key not in store.keys():
             raise UserError(404, 'Not Found')
         del store[key]
-        return {'deleted': True, 'id': id}
+        return DeletedObject(id, cls.object)
 
     @classmethod
     def _api_list_all(cls, url, limit=None, starting_after=None, **kwargs):
@@ -244,6 +244,14 @@ def do_expand(path, obj):
         return obj
 
 
+class DeletedObject(StripeObject):
+    deleted = True
+
+    def __init__(self, id, object):
+        self.id = id
+        self.object = object
+
+
 class Balance(object):
     object = 'balance'
 

localstripe/server.py

@@ -238,8 +238,7 @@ async def f(request):
 def api_delete(cls, url):
     def f(request):
         id = request.match_info['id']
-        ret = cls._api_delete(id)
-        return json_response(ret if isinstance(ret, dict) else ret._export())
+        return json_response(cls._api_delete(id)._export())
     return f