functions.php

<?php

if (!class_exists('Timber')) {
	add_action('admin_notices', function() {
		echo '<div class="error"><p>Timber not activated. Make sure you activate the plugin in <a href="' . admin_url('plugins.php#timber') . '">' . admin_url('plugins.php') . '</a></p></div>';
	});
	return;
}

class StarterSite extends TimberSite {

	function __construct() {
		add_theme_support('post-formats');
		add_theme_support('post-thumbnails');
		add_theme_support('menus');
		add_filter('timber_context', array($this, 'add_to_context'));
		add_filter('get_twig', array($this, 'add_to_twig'));
		add_action('init', array($this, 'register_post_types'));
		add_action('init', array($this, 'register_taxonomies'));
		add_action('init', array($this, 'add_bootstrap_scripts'));
		parent::__construct();
	}

	function register_post_types() {
		//this is where you can register custom post types
	}

	function register_taxonomies() {
		//this is where you can register custom taxonomies
	}

	function add_to_context($context) {
		$context['menu'] = new TimberMenu();
		$context['site'] = $this;
		return $context;
	}

	function add_to_twig($twig) {
		/* this is where you can add your own fuctions to twig */
		$twig->addExtension(new Twig_Extension_StringLoader());
		return $twig;
	}

	function add_bootstrap_scripts() {
		//Load Bootstrap minified js
		wp_enqueue_script( 'bootstrap-js', get_template_directory_uri() . '/js/bootstrap/bootstrap.min.js', array( 'jquery' ), '1' );
	}

}

new StarterSite();