Add Pre/Post functions to godoc

gorp.go

@@ -1889,30 +1889,37 @@ func lockError(m *DbMap, exec SqlExecutor, tableName string,
 	return -1, ole
 }
 
+// PostUpdate() will be executed after the GET statement.
 type HasPostGet interface {
 	PostGet(SqlExecutor) error
 }
 
+// PostUpdate() will be executed after the DELETE statement
 type HasPostDelete interface {
 	PostDelete(SqlExecutor) error
 }
 
+// PostUpdate() will be executed after the UPDATE statement
 type HasPostUpdate interface {
 	PostUpdate(SqlExecutor) error
 }
 
+// PostInsert() will be executed after the INSERT statement
 type HasPostInsert interface {
 	PostInsert(SqlExecutor) error
 }
 
+// PreDelete() will be executed before the DELETE statement.
 type HasPreDelete interface {
 	PreDelete(SqlExecutor) error
 }
 
+// PreUpdate() will be executed before UPDATE statement.
 type HasPreUpdate interface {
 	PreUpdate(SqlExecutor) error
 }
 
+// PreInsert() will be executed before INSERT statement.
 type HasPreInsert interface {
 	PreInsert(SqlExecutor) error
 }