Including parent style.css file in a TwentyTwelve child theme.

functions.php

<?php

/**
 * Callback for WordPress 'wp_enqueue_scripts' action.
 * 
 * This callback is executed before the parent theme (TwentyTwelve) 
 * 'wp_enqueue_scripts' callback is executed.  This is due to the fact 
 * that the child theme functions.php is loaded before the parent functions.php
 * file.
 *
 * This method avoids having the child theme style.css import within the css file.
 *
 * For more information just Google 'css @import problems'. 
 */
function twentytwelve_child_wp_enqueue_scripts(){
  
	/*
         * A note on wp_register_style() and wp_enqueue_style().
	 * You must use wp_register_style() in order to change the source url if 
	 * wp_register_style() or wp_enqueue_style() for the specified handle.
	 * 
	 * Here you can either use wp_register_style() or wp_enqueue_style() and give 
	 * source urls.  I just prefer wp_register_style().
	 */
	wp_register_style( 'twentytwelve-style', get_template_directory_uri() . '/style.css' );
	
	// Register the child (rfmeier) style.css url
	wp_register_style( 'style', get_stylesheet_uri(), array( 'twentytwelve-style' ) );
	
	// Enqueue parent and child styles
	wp_enqueue_style( 'style' );
	
}
add_action( 'wp_enqueue_scripts', 'twentytwelve_child_wp_enqueue_scripts', 11 );

?>