Just showing the quick changes I have been making in function buildDocs(cb) {

cache_warm_diff.js

// From >
// This needs to be tweaked for every type of source
var id = /elife(\d+)\.xml/.exec(url)[1];


// TO :
        // This needs to be tweaked for every type of source
        // as an id we want anything between the last "/" and the last ".xml"
        var urlParts = url.split("/");
        // pick up the last elemet of the url
        var xmlFilename = urlParts.pop(); 
        console.log(xmlFilename); 
        // drop ".xml" 
        var id = xmlFilename.replace('.xml', '');