added optimizer that implements Regularized Dual Averaging (RDA)
added optimizer that implements Regularized Dual Averaging (RDA)

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