code: function modules() {
    // Bootstrap
    var bootstrap = gulp.src('./node_modules/bootstrap/dist/**/*')
      .pipe(gulp.dest('./vendor/bootstrap'));
    // jQuery
    var jquery = gulp.src([
        './node_modules/jquery/dist/*',
        '!./node_modules/jquery/dist/core.js'
      ])
      .pipe(gulp.dest('./vendor/jquery'));
    return merge(bootstrap, jquery);
  }
docs: Bring third party dependencies from node_modules into vendor directory