title: GAE push to deploy when multiple devs
body: <p>By deploy, I assume they mean code changes are pushed to production?</p>
  
  <p>If I had 2 or three devs working with me on a project, what is to stop them from pushing changes that break the production site?</p>
  
  <p>What checks and balances do we have to avoid such error? Do you setup a staging and production environment in GAE, having someone manually verify everything appears to work before making live.</p>