Description:

Stubs out a new api controller. Pass the controller name, either
CamelCased or under_scored, and a list of methods as arguments.

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

This generates a controller class in app/controllers

Example:

`rails generate aginx:controller Api/V1/CreditCards`
`rails generate aginx:controller api/v1/credit_cards`

This will create:
    Controller: app/controllers/api/v1/credit_cards_controller.rb