Replaces any preloaded images with locally cached version

preloaded.js

define(['underscore'], function(_) {
    return {
        replace: function (images) {
            // Look for the image in our preloaded images and replace
            // the path if we find it.
            var preload = window.preload || {};
            _.each(images, function (val, key) {
                if (_.has(preload, val)) {
                    images[key] = preload[val];
                }
            });
            return images;
        },
    };
});