Surely, you don’t want to spend $36 and a bunch of download time testing seven similar games to see which are really worthy of your time. That’s why we’ve tested the entire suite of Mahjong games released so far for OS X iPhone, and figured out which ones are the best and worst. This edition of iPhone Gems covers games from six developers, ranging from free to $9.99 in price, and our top picks this time are two $4.99 games, one of…