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add_action('generate_rewrite_rules', 'themes_dir_add_rewrites');
 
function themes_dir_add_rewrites() {
  $theme_name = next(explode('/themes/', get_stylesheet_directory()));
 
  global $wp_rewrite;
  $new_non_wp_rules = array(
    'styles/(.*)'       => 'wp-content/themes/'. $theme_name . '/styles/$1',
    'scripts/(.*)'        => 'wp-content/themes/'. $theme_name . '/scripts/$1',
    'images/(.*)'    => 'wp-content/themes/'. $theme_name . '/image/$1',
  );
  $wp_rewrite->non_wp_rules += $new_non_wp_rules;
}