Revert "Update: removing the need to call DDLSpec in the migration file"

The odds of getting this perfectly up is not good.

This reverts commit d58ad2ee.

migration/migration.go

@@ -80,14 +80,9 @@ func init() {
 	migrationMap = make(map[string]Migrationer)
 }
 
-//DDLSpec implement in the Inheritance struct for defining structure
-func (m *Migration) DDLSpec() {
-
-}
-
 // Up implement in the Inheritance struct for upgrade
 func (m *Migration) Up() {
-	m.DDLSpec()
+
 	switch m.ModifyType {
 	case "reverse":
 		m.ModifyType = "alter"