Australia has announced an agreement with the tiny Pacific nation of Nauru, enabling it to send hundreds of immigrants to the barren island.The deal affects more than 220 immigrants in Australia, including some convicted of serious crimes.Home Affairs Minister Tony Burke signed the memorandum of understanding on a visit to Nauru, the government said in a statement on Friday.“It contains undertakings for the proper treatment and long-term residence of people who have no legal right to stay in...