update.js

(function() {
    'use strict';
    
    var fs      = require('fs'),
        exec    = require('child_process').exec,
        HEADER  =   '---'               + '\n' +
                    'layout: default'   + '\n' + 
                    '---'               + '\n';
    
    cmd('git checkout master', function() {
        fs.readFile('./README.md', function(error, data) {
            if (error)
                console.log(error);
            else 
                cmd('git checkout gh-pages', function() {
                    var string = HEADER + data.toString();
                    fs.writeFile('index.md', string, console.log.bind(console));
                });
        });
    });
    
    function cmd(str, callback) {
        exec(str, function (error, stdout, stderr) {
            if (!error)
                callback();
            else
                console.log(error);
        });
    }
})();