Issue #286 - License OpenSSL linking exception

This should fix the issue #286 "License OpenSSL linking exception".

1. Added the following disclaimer at each source file

     * In addition, as a special exception, the copyright holders give
     * permission to link the code of portions of this program with the
     * OpenSSL library under certain conditions as described in each
     * individual source file, and distribute linked combinations
     * including the two. 
     * You must obey the GNU General Public License in all respects
     * for all of the code used other than OpenSSL.  If you modify
     * file(s) with this exception, you may extend this exception to your
     * version of the file(s), but you are not obligated to do so.  If you
     * do not wish to do so, delete this exception statement from your
     * version.  If you delete this exception statement from all source
     * files in the program, then also delete it here.

2. Added the LICENSE file with the additional disclaimer (removed the COPYING file)
3. Added the LICENSE.OpenSSL

@awakecoding , do you authorize this change?
@mvanderkolff , can you validate the commit?