* Senior Iranian official defends case of hanging of woman * Western states call for freedom of expression and religion * U.S. urges release of Washington Post journalist (Adds quotes by activists and former lawyer of Jabbari) By Stephanie Nebehay GENEVA, Oct 31 (Reuters) - Iran defended itself on Friday against Western accusations of repression and a sharp rise in executions, including that of a woman hanged for murdering a man she accused of trying to rape her. ...