migrated from groovy to hydro (flawless!)
removed useless outcommented code
made more system independent
replaced node names by $anon node names
created splitted launch files with launch guards (needs ottocar branch of roslaunch) that can include each other -> more modularity
added sleep so that node waits for topics to be published (had issues with that)
launch_guard.py for launch guards
same as exec.sh(executes commands given by command line parameters) but waits one second before executing ("sleep 1 && ..." did not work with exec.sh)
added spark package for bar diagram printing in console from python scripts
some important bug fixes and added optional console output for debugging
remove gravity script that uses high pass filter node
added roslaunch to gitignore