.bowerrc

{
  "directory": "vendor/bower_components"
}

bower.json

{
  "name": "Laravel Application",
  "dependencies": {
    "bootstrap-sass-official": "~3.3.1"
  }
}

gulpfile.js

var elixir = require('laravel-elixir');

/*
 |----------------------------------------------------------------
 | Have a Drink!
 |----------------------------------------------------------------
 |
 | Elixir provides a clean, fluent API for defining some basic
 | Gulp tasks for your Laravel application. Elixir supports
 | several common CSS, JavaScript and even testing tools!
 |
 */

var paths = {
	'jquery': './vendor/bower_components/jquery/',
	'bootstrap': './vendor/bower_components/bootstrap-sass-official/assets/'
}

elixir(function(mix) {
    mix.sass("style.scss", 'public/css/', {includePaths: [paths.bootstrap + 'stylesheets/']})
        .copy(paths.bootstrap + 'fonts/bootstrap/**', 'public/fonts')
        .scripts([
            paths.jquery + "dist/jquery.js",
            paths.bootstrap + "javascripts/bootstrap.js"
        ], './', 'public/js/app.js');
});