do not run hooks twice

lib/model.js

@@ -1187,12 +1187,7 @@ module.exports = (function() {
           return values;
         }
 
-        return self.runHooks('beforeCreate', dao).spread(function(newValues) {
-          dao = newValues || dao;
-          return dao.save({ transaction: options.transaction }).then(function() {
-            return self.runHooks('afterCreate', dao);
-          });
-        });
+        return dao.save({ transaction: options.transaction });
       };
 
       var runValidation = function(dao) {