Description:

Stubs out a new notifier and its views. Passes the notifier name, either
CamelCased or under_scored, and an optional list of topics as arguments.

This generates a notifier class in app/notifiers and invokes your template
engine and test framework generators.

Example:

rails generate notifier AccountsNotifier signup forgot_password

creates a AccountsNotifier notifier class, views, and test:
    Notifier:   app/notifiers/accounts_notifier.rb
    Views:      app/views/accounts_notifier/signup.text.erb [...]
    Test:       test/notifiers/accounts_notifier_test.rb