added bullet dependency check to the unit test for contactConstraintsmex
added bullet dependency check to the unit test for contactConstraintsmex

psiorx/drake,sheim/drake,hanssusilo/drake,psiorx/drake,tkoolen/drake,scottviteri/drake,scottviteri/drake,astrorog/drake,billhoffman/drake,hanssusilo/drake,psiorx/drake,billhoffman/drake,astrorog/drake,scottviteri/drake,crogers3/drake,edowson/drake,crogers3/drake,crogers3/drake,tkoolen/drake,sheim/drake,edowson/drake,thientu/drake,billhoffman/drake,sheim/drake,tkoolen/drake,sheim/drake,scottviteri/drake,billhoffman/drake,crogers3/drake,hanssusilo/drake,billhoffman/drake,astrorog/drake,scottviteri/drake,astrorog/drake,crogers3/drake,scottviteri/drake,edowson/drake,psiorx/drake,thientu/drake,psiorx/drake,edowson/drake,thientu/drake,crogers3/drake,astrorog/drake,astrorog/drake,hanssusilo/drake,psiorx/drake,hanssusilo/drake,sheim/drake,tkoolen/drake,edowson/drake,crogers3/drake,tkoolen/drake,tkoolen/drake,edowson/drake,sheim/drake,edowson/drake,crogers3/drake,billhoffman/drake,psiorx/drake,billhoffman/drake,thientu/drake,hanssusilo/drake,thientu/drake,scottviteri/drake,sheim/drake,tkoolen/drake,thientu/drake,hanssusilo/drake,astrorog/drake,edowson/drake,hanssusilo/drake,billhoffman/drake,sheim/drake,thientu/drake,psiorx/drake