gistfile1.txt

<script>
    var expTiles = jQuery('[class*="col-"]');
    var tmpCount = 0;
    var nextIsFirst = false;
    var maxInRow = 9;

    expTiles.each(function(){
        var myColumns;

        if(nextIsFirst){
            $(this).addClass('first');
            nextIsFirst = false;
            tmpCount = 0;
        }

        myColumns =  parseInt(this.className.match(/col-test-(\d+)/)[1],10);

        tmpCount += myColumns;
        console.log(tmpCount);

        if(tmpCount >= maxInRow){
            nextIsFirst = true;
        }
    });
</script>