Allows easy random quotes in email messages to motivate the sandwich maker.

As if the totally intimidating lunchador won't be intimidating enough!
Makes greetings even better and moves the randomness into its own method.
Gets basic form up and running.
Keeps local login/password from appearing in the Github repo.
Require sender's name in the form for email customization.
Loads ENV variables if there's a local_env.yml file.
Allow emails to be sent from dev and production environments.
WIP: Method to send customized email w/ sandwich information.
HTML and plain text versions of email.
WIP: Tests.