Changed up display_window to work on my linux computer
Changed up display_window to work on my linux computer

chiahaoliu/2016_summer_XPD,cduff4464/2016_summer_XPD,cduff4464/2016_summer_XPD,cduff4464/2016_summer_XPD,chiahaoliu/2016_summer_XPD,chiahaoliu/2016_summer_XPD