[Every week, Gamasutra sums up sister iPhone site FingerGaming's top news and reviews for Apple's nascent -- and increasingly exciting -- portable games platform, as written by editor in chief Danny Cowan and authors Mathew Kumar and Jonathan Glover.] This week, FingerGaming covers Gamevil’s stylish brawler Vanquish, Ubisoft’s iPhone adaptation of Assassin’s Creed II: Discovery, and Gameloft’s Cooking Mama competitor Pocket Chef. Here are the top stories from the last seven days: – Top-Grossing Game …