code: function handleGetFile(file, text) {
      var next = fileCallBacks[file];
      if (next) {
          try {
              next(null, text);
          } catch (e) {
              _reportError(e, file);
          }
      }
      delete fileCallBacks[file];
  }
docs: Handle a response from the main thread providing the contents of a file
  @param {string} file - the name of the file
  @param {string} text - the contents of the file