Loop through jade adding a row every around every two items.

jade-rows.jade

- var perRow = 2;
- var columnAry = new Array(perRow);
- for(var i = 0, nbRows = items.length/perRow; i < nbRows; i++) {
  .row
    each item,index in columnAry
     if items[perRow*i+index]
      .item #{items[perRow*i+index]}
- }