added some cases to held_type_test.
added some cases to held_type_test.


luabind/luabind,luabind/luabind,Kazade/luabind-deboostified,mapbox/luabind,decimad/luabind-deboostified,Wohlhabend-Networks/luabind-deboostified,alex85k/luabind,luabind/luabind,rpavlik/luabind,mdave88/luabind,Oberon00/luabind,lonski/luabind,luabind/luabind,alex85k/luabind,grafi-tt/luabind,Oberon00/luabind,alex85k/luabind,rpavlik/luabind,plsytj/luabind,ltjax/luabind-deboostified,rpavlik/luabind,rpavlik/luabind,MrApplejuice/luabind,rpavlik/luabind,alex85k/luabind,galek/luabind-deboostified,davidar/luabind