Add SMTP settings initializer using dotenv
Add SMTP settings initializer using dotenv

This allows us to connect to Postmark and other SMTP servers to
send email notifications. Explicitly setting delivery_method to :test in
Rake so that emails don't get sent accidentally. Note that user_name and
password for Postmark SMTP are both the Server API Key.

projectjellyfish/jellyfish-notification,projectjellyfish/jellyfish-notification,projectjellyfish/jellyfish-notification