In order for Livereload to work, you need a Firefox or Chrome extension as Gulp doesn't inset it automatically. Alternatively, you can also manually put the livereload script in footer.php, just make sure to insert it only on development environment:
<script>document.write('<script src="http://' + (location.host || 'localhost').split(':')[0] + ':35729/livereload.js?snipver=1"></' + 'script>')</script>