func (rc *ReadCloser) Close() error {
	return rc.f.Close()
}
Close closes the tar.gz file, rendering it unusable for I/O.
package tz
import (
	"archive/tar"
	"compress/gzip"
	"io"
	"os"
	"strings"
	"github.com/unknwon/cae"
)
type ReadCloser struct {
	f    *os.File
	File []*tar.Header
}