PM2 enhancements

[CharlBest]

https://blog.pm2.io/2018-10-03/PM2-Runtime-3-2-Autumn-Features/

• [ ] update pm2 global package on server npm install pm2@latest -g pm2 update
• [ ] ecosystem.config.js add exp_backoff_restart_delay: 100
• [ ] test "pm2 env" to see env variables currently in use and add to README
• [ ] distributing deployments via Tarball Packaging - pm2 package <application_folder>
• [ ] set time in ecosystem to stamp logs with date
• [ ] add max-memory-restart to ecosystem file rather than node argument
• [ ] watch delay now works via config files
• [ ] v4 updates