• add support for auth_publickey_frommemory method (patch by
  Adam Osuchowski)
  
• several documentation improvements
  
• fix broken test, rsa were not used for authentication
  (#rt107382 reported by sisyphus)
  
• fix broken test, sock method can return both IO::Socket::IP
  and IO::Socket::INET objects (#rt107381 reported by
  sisyphus)
  
• improves docs for Net::SFTP::File::write method (#rt58911
  reported by Salvatore Bonaccorso).