new location for google-api-php-client autoload.php

The google-api-php-client is loaded with the following (deprecated) location:

//Including the google-api-php-client library (required).
$autoload_path = libraries_get_path('google-api-php-client') . '/autoload.php';

and the new path should be:

$autoload_path = libraries_get_path('google-api-php-client') . '/src/Google/autoload.php';