A gist to show @jordesign how to add Foundation 5 columns into WordPress.

add_foundation_5_columns_to_wordpress_tinymce.php

<?php
/**
 * Pop this into your functions.php if you like :)
 * 
 */
function jordesigns_mce_buttons( $buttons ) {
	array_unshift( $buttons, 'styleselect' );
	return $buttons;
}
add_filter( 'mce_buttons_2', 'jordesigns_mce_buttons' );

function jordesigns_mce_before_init( $init_array ) {
	$init_array[ 'theme_advanced_styles' ] = "Two Columns=small-6 columns;Three Columns=small-12 medium-4 columns;Four Columns=small-6 medium-3 columns";
	return $init_array;
}
add_filter ('tiny_mce_before_init', 'jordesigns_mce_before_init' );