text: INSERT INTO tipo_unidad (unidad, created_at, updated_at) VALUES ('Tolva o Gondola', '2017-04-22 22:09:31', '2017-04-22 22:09:31');
  INSERT INTO tipo_unidad (unidad, created_at, updated_at) VALUES ('Jaula a Granel', '2017-04-22 22:09:31', '2017-04-22 22:09:31');
  INSERT INTO tipo_unidad (unidad, created_at, updated_at) VALUES ('Caja Cerrada de 48 Pies', '2017-04-22 22:09:31', '2017-04-22 22:09:31');
  INSERT INTO tipo_unidad (unidad, created_at, updated_at) VALUES ('Caja Cerrada de 53 Pies', '2017-04-22 22:09:31', '2017-04-22 22:09:31');