Add debug mode

[Gelean]

Add ability to run deldbot in debug mode with console.log statements activated on a flag

https://www.twilio.com/blog/working-with-environment-variables-in-node-js-html

[Gelean]

https://www.sitepoint.com/debug-node-app-tips-tricks-tools

[Gelean]

From @leovander: https://www.npmjs.com/package/debug