• Net::SSH2::SFTP::realpath fix (Hugues Lafarge).
  
• Make compatible with perl 5.6 (rt.cpan.org #22821, SISYPHUS); required
  minimal changes to typemap and use lines (untested).
  
• libssh2 0.13 seems to work, libssh2 0.14 still fails some tests.
  
• Add missing Net::SSH2::PublicKey object.
  
• Use (arbitrary) 8K buffer in scp_get and scp_put methods, rather
  than trying to transfer the whole file at once (rt.cpan.org #20679).
  
• Remove 'use Term::ReadKey'; it's already 'require'd in the keyboard
  authentication callback (rt.cpan.org #22786).
  
• Provide libssh2 with Perl's allocator callbacks and use Perl_malloc/
  Perl_mfree instead of bare malloc/free (rt.cpan.org #23930).