docs: function _bundleEPUB(config, done) {
      
      var epubconfig = config.akashacmsEPUB;
      
      var archive = archiver('zip');
      
      var output = fs.createWriteStream(config.akashacmsEPUB.bookmetadata.epub);
              
      output.on('close', function() {
          logger.info(archive.pointer() + ' total bytes');
          logger.info('archiver has been finalized and the output file descriptor has closed.');
          done();
      });
      
      archive.on('error', function(err) {
        logger.info('*********** BundleEPUB ERROR '+ err);
        done(err);
      });
      
      archive.pipe(output);
      
      // The mimetype file must be the first entry, and must not be compressed
      archive.append(
          fs.createReadStream(path.join(config.root_out, "mimetype")),
          { name: "mimetype", store: true });
      archive.append(
          fs.createReadStream(path.join(config.root_out, "META-INF", "container.xml")),
          { name: path.join("META-INF", "container.xml") });
      archive.append(
          fs.createReadStream(path.join(config.root_out, config.akashacmsEPUB.bookmetadata.opf)),
          { name: config.akashacmsEPUB.bookmetadata.opf });
      // archive.append(
      //     fs.createReadStream(path.join(config.root_out, config.akashacmsEPUB.files.ncx)),
      //    { name: config.akashacmsEPUB.files.ncx });
      
      // logger.info(util.inspect(config.akashacmsEPUB.manifest));
      async.eachSeries(config.akashacmsEPUB.manifest,
          function(item, next) {
              // logger.info(util.inspect(item));
              // if (item.spinetoc !== true) { // this had been used to skip the NCX file
              archive.append(
                  fs.createReadStream(path.join(config.root_out, item.href)),
                  { name: item.href }
              );
              // }
              next();
          },
          function(err) {
              if (err) logger.error(err);
              logger.info('before finalize');
              archive.finalize();
          });
  }