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="' . esc_url( admin_url( 'plugins.php#timber' ) ) . '">' . esc_url( admin_url( 'plugins.php' ) ) . '</a></p></div>';
		} );
	return;
}

Timber::$dirname = array('templates', 'views');

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_filter( 'embed_oembed_html', 'alx_embed_html', 10, 1 );

		add_action( 'init', array( $this, 'register_post_types' ) );
		add_action( 'init', array( $this, 'register_taxonomies' ) );
		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['foo'] = 'bar';
		$context['stuff'] = 'I am a value set in your functions.php file';
		$context['notes'] = 'These values are available everytime you call Timber::get_context();';
		$context['menu'] = new TimberMenu('Main Menu');
		$context['superMenu'] = new TimberMenu('Super Menu');
		$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() );
		$twig->addFilter( 'myfoo', new Twig_Filter_Function( 'myfoo' ) );
		return $twig;
	}
	/*  Add responsive container to embeds
	/* ------------------------------------ */ 
	function alx_embed_html( $html ) {
	    return '<div class="video-container">' . $html . '</div>';
	}

}

new StarterSite();

function wrap_embed_with_div($html, $url, $attr) {

     return '<div class="video-container">' . $html . '</div>';

}

add_filter('embed_oembed_html', 'wrap_embed_with_div', 10, 3);