Make Drupal 7 aggregation efficient again and use Google CDN for jQuery and jQuery UI

gistfile1.aw

<?php

/**
 * Implements hook_library().
 */
function MYMODULE_library() {
  // jQuery UI from Google.
  $libraries['ui'] = array(
    'title' => 'jQuery UI: All',
    'website' => 'http://jqueryui.com',
    'version' => '1.8.7',
    'js' => array(
      'http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.7/jquery-ui.min.js' => array(
        'type' => 'external',
      ),
    ),
  );
  return $libraries;
}

/**
 * Implements hook_library_alter().
 */
function MYMODULE_library_alter(&$libraries, $module) {
  if ($module == 'system') {

    // Replace jQuery with Google CDN.
    $url = 'https://ajax.googleapis.com/ajax/libs/jquery/'. $libraries['jquery']['version'] .'/jquery.min.js';

    $libraries['jquery']['js'][$url] = $libraries['jquery']['js']['misc/jquery.js'];
    $libraries['jquery']['js'][$url]['type'] = 'external';

    unset($libraries['jquery']['js']['misc/jquery.js']);

    // Rewrite jQuery UI libraries to depend on Google CDN.
    foreach ($libraries as $key => &$value) {
      if ((strpos($key, 'ui') === 0) || (strpos($key, 'effects') === 0)) {
        $value['js'] = array();
      }
    }
    $libraries['ui']['dependencies'][] = array('MYMODULE', 'ui');
    $libraries['effects']['dependencies'][] = array('MYMODULE', 'ui');
  }
}


/**
 * Implements hook_js_alter().
 *
 * see http://www.metaltoad.com/blog/drupal-7-taking-control-css-and-js-aggregation
 */
function MYMODULE_js_alter(&$javascript) {
  uasort($javascript, 'drupal_sort_css_js');
  $i = 0;
  foreach ($javascript as $name => $script) {
    $javascript[$name]['weight'] = $i++;
    $javascript[$name]['group'] = JS_DEFAULT;
    $javascript[$name]['every_page'] = FALSE;
  }
}

/**
 * Implements hook_css_alter().
 *
 * see http://www.metaltoad.com/blog/drupal-7-taking-control-css-and-js-aggregation
 */
function MYMODULE_css_alter(&$css) {
  uasort($css, 'drupal_sort_css_js');
  $i = 0;
  foreach ($css as $name => $style) {
    $css[$name]['weight'] = $i++;
    $css[$name]['group'] = CSS_DEFAULT;
    $css[$name]['every_page'] = FALSE;
  }
}