experimental: add getStatusTopic method to retrieve action status#1146

ikwilnaarhuisman wants to merge 1 commit intoRobotWebTools:developRobotWebTools/roslibjs:developfrom

ikwilnaarhuisman:experimental/get-status-through-actionikwilnaarhuisman/roslibjs:experimental/get-status-through-actionCopy head branch name to clipboard