Description:
    Stubs out a new helper. Pass the helper name, either CamelCased
    or under_scored.

    To create a helper within a module, specify the helper name as a
    path like 'parent_module/helper_name'.

Example:
    `rails generate helper Notifications::Item`

    Credit card helper.
        Helper:     app/helpers/notifications/base_helper.rb
        Helper:     app/helpers/notifications/items_helper.rb
