gistfile1.js

$(document).ready(function() {
    
    Number.prototype.times = function(value) {
        for (var i = 0; i < this; i++) {
            value();
        }
    }

    function wrapEveryFour(children) {
        var groupsOfFour = Math.floor(children.length / 4) + 1;
        
        (groupsOfFour).times(function() {
            $(children.splice(0,4)).wrapAll('<div class="row"></div>');
        });
    }

    $('#content > section').each(function() {
        var children = $(this).children('section');

        wrapEveryFour(children);
    });
});