Add simple variant proxy

lib/open_food_network/variant_proxy.rb

@@ -0,0 +1,19 @@
+module OpenFoodNetwork
+  class VariantProxy
+    instance_methods.each { |m| undef_method m unless m =~ /(^__|^send$|^object_id$)/ }
+
+    def initialize(variant, hub)
+      @variant = variant
+      @hub = hub
+    end
+
+    def price
+      VariantOverride.price_for(@variant, @hub) || @variant.price
+    end
+
+
+    def method_missing(name, *args, &block)
+      @variant.send(name, *args, &block)
+    end
+  end
+end