Welcome to this week’s edition of iPad Gems! Our latest roundup of games is focused primarily on titles for Apple’s tablet, though each of the titles either includes iPhone/iPod touch support or sells alongside a similar standalone app for that purpose—the former is obviously strongly preferred. Our top pick of the bunch is Pirates vs. Ninjas vs. Zombies vs. Pandas, an amusingly named rival to Rovio’s Angry Birds. We’ve…