get rid of factorNeighborIndex which was not only unused but also being set incorrectly
get rid of factorNeighborIndex which was not only unused but also being set incorrectly

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