message: stop servers on error in run script
diff: #!/bin/bash
  -set -e
  +
  +stop_servers() {
  + ./riot/stop.sh
  + ./synapse/stop.sh
  +}
  +
  +handle_error() {
  + EXIT_CODE=$?
  + stop_servers
  + exit $EXIT_CODE
  +}
  +
  +trap 'handle_error' ERR
  +
  ./synapse/start.sh
  ./riot/start.sh
  node start.js
  -./riot/stop.sh
  -./synapse/stop.sh
  +stop_servers
  