Add script to scrape images for featured images similar to new Press This!

[0aveRyan]

https://core.trac.wordpress.org/browser/trunk/src/wp-admin/includes/class-wp-press-this.php?rev=32999#L55

[aschweigert]

i'm a little concerned about legal issues with this one, many folks won't care but we should at least give people the option to opt out of storing images locally (for their own protection)