PHP short tags

I discovered a small incompatibility with certain PHP installs. In version 2.3.2 of the plugin, in the sg_popup_media_button.php file, line 118 makes use of the <?= short tag for PHP. In versions of PHP prior to 5.4, this short tag will not work if the PHP’s short_open_tag option is set to false in the php.ini. In PHP 5.4 or greater, the <?= short tag always works regardless of the setting (according to PHP docs). To fix for older versions of PHP, change <?= to <?php echo

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