Add fallback for file_get_contents()

[jeroendesloovere]

Somebody had errors using addMedia() and "file_get_contents()" (#75)
So maby we should add a fallback like in this example

[claytoncollie]

I'm not the greatest with github just yet.

in VCard.php, replace lines 231-235 with

`

    if (function_exists('curl_version')) {

        $curl = curl_init();
        curl_setopt($curl, CURLOPT_URL, $url);
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
        $value = curl_exec($curl);
        curl_close($curl);

    } elseif (file_get_contents(__FILE__) && ini_get('allow_url_fopen')) {

        $value = file_get_contents($url);

    } else {

        throw new VCardMediaException('Nothing returned from URL.');
        
    }

`

Had to do this for sites hosted on WP Engine.