VATICAN CITY (Reuters) - Pope Francis, who has expressed alarm over the rise of Islamic State militants and the plight of Christians in the Middle East, has summoned his envoys in the region to a rare meeting to discuss a response to the crisis, the Vatican said on Tuesday. The Oct. 2-4 gathering will include Vatican ambassadors to Jordan, Iraq, Iran, Leba**n, Syria, Turkey, Israel and the Palestinians as well as representatives to the United Nations and the European Union. ...