code: function _load2write(dest, source, callback) {
    _load(source, _pipe.bind(null, _write.bind(null, dest), callback));
  }
docs: Loads json source file and creates fs structure according to the
  loaded data.
  This is high level utility. It pipes result of _load to _write.
  @param {String} dest - Path to destination location on file system.
  @param {String} source - File system path of the source json file.
  @param {Function} callback - Callback that expects only a possible
  error.