Updates included in release 3283

Added WordPress Sleep option to slow down wordpress API calls. See new “Wait 1 second between API calls” option.
 Added WordPress User Agent setting to thwart robot-blocking on WordPress installations. See new “Spoof User Agent?” option
 Added option to change filter combine logic (AND or OR)
 Added absolute URL to file uploader to admin_cdn_base to prevent bad URLs on remotely published pages.
 Added validation to the offers form to require http before any link