workaroud wp_cron post filtering (because it's not excecuted as admin)

wp_cron filters out <iframe> in content. so the instagram embed code
won’t be saved into the post. this is a workaround with a shortcode.
another possibility would be to deactivate the filtering, but that’s
unsafe, so they say.
corrects a copy&paste oversight

solves #82
added "rated videos" to fav import