Add mail initializer with Mailgun credentials
Avoid Slim warning
Add welcome email for users created by admin user
To fixup with previous commit
Add welcome message for users created via Devise controller + improved welcome_with_password
Add user destroy action
Add postageapp, remove mailgun stuff
Configure email after user creation by admin (via postageapp)
Add welcome email when user registers itsef (via postageapp)
Use postage mailer to send welcome emails
Add reset password email via postageapp mailer
Add email interceptor for non production environments
Hum hum
Extract secret token to env var