During the second quarter of 2013, Google Play surpassed Apple's App Store in app downloads for the first time, a study has found. Despite this, Apple still brought in more than double the revenue from its App Store than Google did from Google Play.Related StoriesShould I buy an iPhone 5 or wait for iPhone 5S, iPhone 6?Low-cost iPhone: 'C' for cheap, color or classic?Samsung smartphones beat last thre