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'.

    This generates a model class in app/models and a migration in db/migrate.

Examples:
    `./script/generate jfs_model Account`

        creates an Account model and migration:
            Model:      app/models/account.rb
            Migration:  db/migrate/XXX_add_accounts.rb

    `./script/generate model Article title:string content:text`

        creates an Article model with a string title and text body,.