Remember me token expires randomly

Pull requests really help with self review and a once-over code review by others

Remember me doesn't. It's somewhat forgetful - possibly because the remember me tokens expire when stash reboots. When I get prompted to log in, I get no hint as to what failed with the process. Thankfully the error I'd seen a month ago telling me my account may have been compromised (wtf? Via a remember me token??) is not shown this time.