build a params dictionary with current editId and packageName.

        use optional params parameter
        to merge additional params into resulting dictionary.

def build_params(self, params={}):
        """
        build a params dictionary with current editId and packageName.

        use optional params parameter
        to merge additional params into resulting dictionary.
        """
        z = params.copy()
        z.update({'editId': self.edit_id, 'packageName': self.package_name})
        return z