tarea para concatenar todos los archivos css por modulo

gulp dist

```javascript
/*!!
* @author: Juan Pablo
* Tarea para comprimir y combinar todos los archivos compilados 
* a un archivo final
* http://stackoverflow.com/a/23731040
* 
* tarea : gulp build
* instalar : npm install event-stream --save-dev
*/

function Task(gulp, path, options, plugins, settings, callback) {

	function getFolders(settings, dir) {
	    return settings.fs.readdirSync(dir)
	      .filter(function(file) {
	        return settings.fs.statSync(dir+file).isDirectory();
	      });
	}
	function format_gulp(name){
		return name + '/*.css';
	}

	gulp.task('dist', function () {

		var output = path.dest.css;
		var random = Math.round(Math.random()*99999999999999);
		var dir_helpers = output + '_helpers/';
		var dir_layouts = output + 'layouts/';
		var dir_modules = output + 'modules/';

		var folders = getFolders(settings, dir_modules);

		var task_modules_css = folders.map(function(folder)
		{
			var files_layout = format_gulp(dir_layouts + folder);
			var files_module = format_gulp(dir_modules + folder);
			var src_gulp = (folder=='all') ? [] : [files_layout, files_module];

			return gulp.src(src_gulp)
		        .pipe(plugins.concat(folder + '.min.css'))
		        .pipe(gulp.dest(output + 'dist'));
		});

		var task_files_css = gulp.src([
				dir_modules + 'all/all.css',
				dir_layouts + 'layout.css',
				dir_helpers + '**/*.css',
				dir_modules + '/*.css',
			])
			.pipe(plugins.concat('all.min.css'))
			.pipe(gulp.dest(output + '/dist'));

		return plugins.merge(task_modules_css, task_files_css);
	});

}

module.exports = Task;
```