Description:
    Copy mailers into the host app for customization.

Example:
    rails generate mr_common:mailers

    This will create view overrides for customization at:
        app/mailers/mr_common/registration_mailer.rb
        app/views/mr_common/registration_mailer/unconfirmed_registration.html.erb
        app/views/mr_common/registration_mailer/unconfirmed_registration.text.erb
        app/views/mr_common/registration_mailer/confirmed_registration.html.erb
        app/views/mr_common/registration_mailer/confirmed_registration.text.erb
        app/views/mr_common/registration_mailer/revoked_registration.html.erb
        app/views/mr_common/registration_mailer/revoked_registration.text.erb
        app/views/mr_common/registration_mailer/_html_reminders.html.erb
        app/views/mr_common/registration_mailer/_text_reminders.text.erb