Rovio’s Angry Birds Rio HD is now free in version 1.8.0. The game also has added 26 new levels — 20 standard levels and 6 bonus levels to unlock. Two new characters have also been introduced into the game: Stella, with her bubble blower, and Rocket Bird, who appears in the new bonus levels. Camera+ ($2) from tap tap tap has updated to version 5, which introduces “The Lab” — a collection of cool new photo editing options. The…