Lyft Inc. has gained the necessary regulatory clearance to complete its acquisition of European taxi app Freenow, setting the stage for the US rideshare company to expand its operations into Europe.Both companies will point users to download each other’s apps starting Thursday: Lyft riders will see a prompt to get the Freenow app when they are in the 180 European cities where Freenow operates, while Freenow customers will be prompted to install Lyft when they’re in the US or Canada. Over time, u...