fix displayhook
fix displayhook
SciRuby/iruby,mijoharas/iruby,Sharpie/iruby,zalt50/iruby,SciRuby/iruby,minrk/iruby,minrk/iruby,zalt50/iruby,jjn2009/iruby,Sharpie/iruby,minrk/iruby,zalt50/iruby,Rambatino/pi-ruby,astroboxio/iruby,hainesr/iruby,SciRuby/iruby,SciRuby/iruby,jjn2009/iruby,domitry/iruby,hainesr/iruby,Rambatino/pi-ruby,zalt50/iruby,astroboxio/iruby,mijoharas/iruby,domitry/iruby