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'.

    This generates a helper class in app/helpers and a helper test
    suite in test/unit/helpers.

Example:
    `./script/generate helper CreditCard`

    Credit card helper.
        Helper:     app/helpers/credit_card_helper.rb
        Test:       test/unit/helpers/credit_card_helper_test.rb

Modules Example:
    `./script/generate helper 'admin/credit_card'`

    Credit card admin helper.
        Helper:     app/helpers/admin/credit_card_helper.rb
        Test:       test/unit/helpers/admin/credit_card_helper_test.rb