add balance ,shop promotion

go/gopath/src/fohow.com/apps/models/promotion_model/init.go

@@ -5,5 +5,5 @@ import (
 )
 
 func init() {
-	orm.RegisterModel(new(AdPosition))
+	orm.RegisterModel(new(Promotion), new(ShopPromotion), new(BalancePromotion), new(Present))
 }