greatly improve efficiency of tensor*scalar weights, as well as implement caching of twoNormSq for Pegasos
greatly improve efficiency of tensor*scalar weights, as well as implement caching of twoNormSq for Pegasos

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