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Description:
    Stubs out a new model. Pass the model name, either CamelCased or
    under_scored, and an optional list of attribute pairs as arguments.

    Attribute pairs are column_name:sql_type arguments specifying the
    model's attributes. Timestamps are added by default, so you don't have to
    specify them by hand as 'created_at:datetime updated_at:datetime'.

    You don't have to think up every attribute up front, but it helps to
    sketch out a few so you can start working with the model immediately.

    This generates a model class in app/models, a unit test in test/unit,
    a test fixture in test/fixtures/singular_name.yml, and a migration in
    db/migrate.

Examples:
    `./script/generate model account`

        creates an Account model, test, fixture, and migration:
            Model:      app/models/account.rb
            Test:       test/unit/account_test.rb
            Fixtures:   test/fixtures/accounts.yml
            Migration:  db/migrate/XXX_add_accounts.rb

    `./script/generate model post title:string body:text published:boolean`

        creates a Post model with a string title, text body, and published flag.