How install laravel-elixir-livereload on laravel5

I installed step by step from http://ift.tt/1U1FGIH but it doesn't work.

npm install --save-dev laravel-elixir-livereload

Next, I added it to my Elixir-enhanced Gulpfile, like:

var elixir = require('laravel-elixir');
require('laravel-elixir-livereload');
elixir(function(mix) {
   mix.livereload();
});

via Chebli Mohamed