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Add a simple Heartbeat-DiagnosticTask #73
Basic use-case for me is to simply know whether a node is alive or not. The reason to build this is we have a NVidia Jetson board running a ROS service. Sometimes the board isn't booting for whatever reason. Simply broadcasting "I'm alive!" already helps in detecting that.
It's a service, so various existing DiagnosticTasks do not make sense.
Example use is in tue-robotics/image_recognition#55
For some reason, the Travis build is broken with
ImportError: "from catkin_pkg.package import parse_package" failed: No module named catkin_pkg.package