added Sentry and Laravel-Guard
Set nginx server variables for database and mail config. Also updated Boxfile with Laravel env. Added 'yetti' to bootstrap config.
Added BadgerInstallCommand to initialise application
Update README.md
Update README.md

Removed backticks from 'badger:install' code block.
Fixes #1. User management via Sentry 2 is now ready to implement.
Merge branch 'feature/auth_setup' into develop

* feature/auth_setup:
  Fixes #1. User management via Sentry 2 is now ready to implement.
  Update README.md
  Update README.md
  Added BadgerInstallCommand to initialise application
  Set nginx server variables for database and mail config. Also updated Boxfile with Laravel env. Added 'yetti' to bootstrap config.
  added Sentry and Laravel-Guard