Rename demo offers module to be the same as sandbox

(So the fixture loads in both envs).

sites/demo/apps/custom_offers.py → sites/demo/apps/offers.py

@@ -27,3 +27,22 @@ class BasketOwnerCalledBarry(models.Condition):
 
     def consume_items(self, basket, affected_lines):
         return
+
+
+class ChangesOwnerName(models.Benefit):
+
+    class Meta:
+        proxy = True
+
+    def apply(self, basket, condition, offer=None):
+        condition.consume_items(basket, ())
+        return models.PostOrderAction(
+            "You will have your name changed to Barry!")
+
+    def apply_deferred(self, basket):
+        basket.owner.first_name = "Barry"
+        basket.owner.save()
+
+    @property
+    def description(self):
+        return "Changes owners name"