lib/pass.js
function addFile(filename) {
    var file = zip.addFile(filename);
    var sha = new SHAWriteStream(manifest, filename, file);
    return sha;
  }
function addFile(filename) {
    var file = zip.addFile(filename);
    var sha = new SHAWriteStream(manifest, filename, file);
    return sha;
  }
Add file to zip and it's SHA to manifest