update CHANGELOG in preparation for release
update CHANGELOG in preparation for release

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