code: function findFile(fileList, ifCb, elseCb) {
    var fsExists = fs.exists || path.exists;
    async.detect(fileList, fsExists, function (file) {
      if (file) {
        ifCb(file);
      } else {
        elseCb();
      }
    });
  }
docs: /*
  Find one of a list of files.
  @param {Array} fileList Possible files to find.
  @param {function} ifCb If one is found, do this.
  @param {function} elseCb If one is not found, do this.