new (Imlib2::Gradient)

    /*
     * Return a new Imlib2::Gradient.
     *
     * Examples:
     *   # create a blue to green gradient
     *   grad = Imlib2::Gradient.new
     *   grad.add_color 0, Imlib2::Color::BLUE
     *   grad.add_color 100, Imlib2::Color::GREEN
     *
     *   # create a red to yellow to black gradient
     *   colors = [ [0,   Imlib2::Color::RED    ],
     *              [100, Imlib2::Color::YELLOW ],
     *              [200, Imlib2::Color::BLACK  ] ]
     *   grad = Imlib2::Gradient.new *colors
     *
     */
    VALUE gradient_new(int argc, VALUE *argv, VALUE klass) {