Downloads a jar and shell script to $PATH (path). Once complete, cd into
the path and run sudo chmod u+x robot in the terminal to make ROBOT
executable. Learn more at http://robot.obolibrary.org/.
install_robot( jar_url = "https://github.com/ontodev/robot/releases/download/v1.7.2/robot.jar", sh_url = "https://raw.githubusercontent.com/ontodev/robot/master/bin/robot", path = "/usr/local/bin" )