More tweaks to the start script
More tweaks to the start script

- When running the dev server, respond to hangup signal by restarting the
  stopped server

- Environment variable AUTO_RELOAD to turn on gunicorn code reloading

codeforboston/cornerwise,cityofsomerville/cornerwise,codeforboston/cornerwise,cityofsomerville/citydash,cityofsomerville/cornerwise,codeforboston/cornerwise,codeforboston/cornerwise,cityofsomerville/cornerwise,cityofsomerville/citydash,cityofsomerville/citydash,cityofsomerville/cornerwise,cityofsomerville/citydash