Make rospack check for package.xml
Make rospack check for package.xml

Leaving in check for manifest.xml to preserve backwards compatibility.
Resolves #646

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