Concat normalize.css in css files using Grunt

Gruntfile.js

/**
 * Gruntfile loading external tasks
 * 
 * ./Gruntfile.js
 * 
 * @param  grunt
 * @author Thiago Poiani <[email protected]>
 */
module.exports = function (grunt) {
  'use strict';

  // load tasks directory
  grunt.loadTasks('grunt_tasks');

  grunt.registerTask('default', ['normalize-concat']);

};

normalize-concat.js

/**
 * Task for concat normalize.css in all css files inside the directory ./css
 * 
 * ./grunt_tasks/normalize-concat.js
 * 
 * @param  grunt
 * @author Thiago Poiani <[email protected]>
 */
module.exports = function (grunt) {
  'use strict';

  var normalize, css, files, name, concat;

  // normalize.css path
  // bower install normalize.css --save
  normalize = './bower_components/normalize.css/normalize.css';

  // css files path
  css = './css/';

  grunt.loadNpmTasks('grunt-contrib-concat');

  grunt.registerTask('normalize-concat', function () {
    // all .css files
    files = grunt.file.expand(css + '*.css');

    files.forEach(function (file) {
      // css file name
      name = file.replace(css, '');

      concat = grunt.config.get('concat') || {};

      concat[name] = {
        src: [normalize, file],
        dest: file
      };

      grunt.config.set('concat', concat);
    });

    grunt.task.run('concat');
  });

};