add launch file for example setup
add launch file for example setup

This provides a cleaner way to start (and kill) all the nodes required for the tests

kbendick/roslibjs,chrisl8/roslibjs,harmishhk/roslibjs,BennyRe/roslibjs,jeansebbaklouti/roslibjs,harmishhk/roslibjs,harmishhk/roslibjs,DLu/roslibjs,kbendick/roslibjs,DLu/roslibjs,chrisl8/roslibjs,eadlam/roslibjs,eadlam/roslibjs,BennyRe/roslibjs,DLu/roslibjs,kbendick/roslibjs,jeansebbaklouti/roslibjs