Add ftp deployer plugin

[haosdent]

Add ftp deployer plugin, and user could set the params of ftp in _config.yml.

[tommy351]

Why not use util.spawn?

[haosdent]

Sorry, I should use util.spawn.

[haosdent]

Pull a new request to repo?

[tommy351]

I have rewrittien it with util.spawn. (Not yet test)

spawn({
  command: 'ncftpput',
  args: ['-R', '-u', config.user, '-p', config.password, '-P', config.port, config.host, config.root, '*'],
  options: {cwd: hexo.public_dir},
  exit: function(code){
    if (code === 0){
      console.log('Deploy completely.');
      callback();
    }
  }
});

[haosdent]

Oh. I realize that user should install ncftp first. If hexo couldn't found ncftp in system, I should show some friendly message.

[floriancargoet]

I didn't realize this deployer existed when I created hexo-deployer-ftp.
It handles interactive password input so that you don't have to put it in your config file.

Edit: I couldn't find this deployer in the current version of hexo.