MindSmack has released an update to FastMall, its interactive mall navigation and shopping application, adding offline access and barcode-based price comparisons. FastMall provides maps and information on the largest shopping malls in the U.S., the U.K., Canada and France to help users easily find stores and other amenities such as restrooms and elevators while inside the mall. FastMall 3.0 now integrates with ShopSavvy to allow users to scan product…