Rovio has released another update to Angry Birds, adding fifteen new tropical-themed levels along with a new set of power-ups. Continuing the beach vacation theme introduced in the last update, the newest version adds four new power-ups: King Sling, Birdquake, Super Seeds and Sling Scope to help players gain the elusive third star on even the most challenging levels. The game is available in two separate versions: Angry Birds ($1) for the iPhone and…