Description:

Stubs out a new generator at lib/generators. Pass the generator name as an argument,
either CamelCased or snake_cased.

Example:

`quails generate generator Awesome`

creates a standard awesome generator:
    lib/generators/awesome/
    lib/generators/awesome/awesome_generator.rb
    lib/generators/awesome/USAGE
    lib/generators/awesome/templates/
    test/lib/generators/awesome_generator_test.rb