code: function initSubmodules(cb) {
    console.log('Detected a git install');
    console.log('Cloning libSass into src/libsass');
  
    var clone = spawn('git', ['clone', 'git@github.com:sass/libsass.git', './src/libsass']);
    manageProcess(clone, function(err) {
      if (err) {
        cb(err);
        return;
      }
  
      console.log('Checking out libsass to ' + pkg.libsass);
  
      var checkout = spawn('git', ['checkout', pkg.libsass], { cwd: './src/libsass' });
      manageProcess(checkout, function(err) {
        cb(err);
      });
    });
  }
docs: initSubmodules
  
  @param {Function} cb
  @api private