Adapted header2.el file

Original header2.el file could be downloaded in http://www.emacswiki.org/header2.el
---
Description: Support for creation and update of file headers.
Author: Lynn Slater
        Drew Adams
Maintainer: Drew Adams (concat "drew.adams" "@" "oracle" ".com")
Copyright (C) 1996-2014, Drew Adams, all rights reserved.
Copyright (C) 1989 Free Software Foundation, Inc.
Copyright (C) 1988 Lynn Randolph Slater, Jr.
Created: Tue Aug  4 17:06:46 1987
Version: 0
Last-Updated: Ter Mai 27 15:16:28 2014 (-0300)
          By: Rodrigo Sant'Ana
URL: http://www.emacswiki.org/header2.el