VIENNA (Reuters) - An Austrian man taken hostage in Yemen in December has appeared in a video posted on YouTube, saying he would be killed if ransom money was not paid to a Yemeni tribe within a week. Pictured with what appeared to be an AK47 automatic rifle pointed at his head, Dominik Neubauer said he was in good health and appealed to the Yemeni and Austrian governments and the European Union to give his hostage takers what they wanted. "Mum, Dad, Lucas, Angela, I love you more than anything. ...