Loving 3.0, but I'm curious if @include container() and @include span() are being removed? They no longer work with my existing system after updating. If the following is not preferred can you please use the example below to show me how you would do this with Susy instead?

#page {
    main {
        @include container();
        article {
            @include span(3 of 4);
        }
        aside {
            @include span(1 of 4);
        }
    }
}

Thank you for all your hard work on this. Susy has changed my life within my career, seriously.