Welcome to this week’s first gaming edition of iPhone + iPad Gems! Today’s collection of games includes three action-platformers of various stripes, as well as a sequel to a popular Electronic Arts racer. Our top picks in the bunch are the 2.5-D robot platformers Cordy and Roboto, but EA’s Shift 2 Unleashed is also worth seeing if you’re a fan of the Need For Speed franchise. Read on for all the details. Cordy Of the three…