Change VariableSeq from a class to a trait.
Change VariableSeq from a class to a trait.

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