DUBAI, May 17 (Reuters) - An Iraqi resistance group said two of its members carried out the attack that killed the head of the Iraqi Governing Council on Monday, an Islamic Web site said. Izzedin Salim was killed along with at least six other people in a car bombing in central Baghdad. "Two hero members of the 'Arab Resistance Group - al-Rashid Brigades'...carried out the heroic operation which led to the death of the mercenary traitor Izzedin Salim," said a statement posted on the site. "The Brigades promise our nation's people that they will fight until the liberation of Iraq...