Laravel.io
var elixir = require('laravel-elixir');

/*
 |--------------------------------------------------------------------------
 | Elixir Asset Management
 |--------------------------------------------------------------------------
 |
 | Elixir provides a clean, fluent API for defining some basic Gulp tasks
 | for your Laravel application. By default, we are compiling the Less
 | file for our application, as well as publishing vendor resources.
 |
 */

elixir(function(mix) {
    mix
    	.copy('public/Unify1_8/plugins/bootstrap/css/bootstrap.css', 'resources/assets/css/bootstrap.css')
    	.copy('public/Unify1_8/css/ie8.css', 'resources/assets/css/ie8.css')
    	.copy('public/Unify1_8/css/blocks.css', 'resources/assets/css/blocks.css')
    	.copy('public/Unify1_8/css/plugins.css', 'resources/assets/css/plugins.css')
    	.copy('public/Unify1_8/css/app.css', 'resources/assets/css/app.css')
    	.copy('public/Unify1_8/css/style.css', 'resources/assets/css/style.css')
	    .styles([
	        'bootstrap.css',
	        'ie8.css',
	        'blocks.css',
	        'plugins.css',
	        'app.css',
	        'style.css'
	    ], 'public/assets/css/frontend.css');

	mix.version([
		'public/assets/css/frontend.css'
	]);
});

Please note that all pasted data is publicly available.