optimize: better logging in SGD and Hogwild trainers
optimize: better logging in SGD and Hogwild trainers

strubell/factorie,malcolmgreaves/factorie,patverga/factorie,pogren-oracle/factorie,Craigacp/factorie,digitalreasoning/factorie-scala-210,joprice/factorie,melisabok/factorie,asubbaswamy/factorie,hlin117/factorie,zxsted/factorie,factorie/factorie