Remove Modernizr-specific code.

The Modernizr module implements the force header flag that Omega/Aurora utilize. There's no need for it to be present in your codebase :)

Remove this function:

/**
  * Implements hook_js_alter
  */
function aurora_js_alter(&$js) {
  global $base_url;
  // Forces Modernizr to header if the Modernizr module is enabled.
  if (module_exists('modernizr')) {
    $js[modernizr_get_path()]['force header'] = true;
  }
}