gistfile1.js

function wrapEveryFour(children) {
   for (var i = 0; i < (children.length / 4); i++) {
       children.splice(0,4).wrapAll(container);
   }
}

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