Updates the details for a person. Password is optional and is only updated if supplied.

def update(self, new_email_address, name, access_level, password=None):
        """Updates the details for a person. Password is optional and is only updated if supplied."""
        params = {"email": self.email_address}
        body = {
            "EmailAddress": new_email_address,
            "Name": name,
            "AccessLevel": access_level,
            "Password": password}
        response = self._put("/clients/%s/people.json" % self.client_id,
                             body=json.dumps(body), params=params)
        # Update self.email_address, so this object can continue to be used
        # reliably
        self.email_address = new_email_address