Returns the human readable date of when the user signed up for google reader.

def getUserSignupDate(self):
        """
        Returns the human readable date of when the user signed up for google reader.
        """
        userinfo = self.getUserInfo()
        timestamp = int(float(userinfo["signupTimeSec"]))
        return time.strftime("%m/%d/%Y %H:%M", time.gmtime(timestamp))