code: public static Array<FileHandle> sortFiles (FileHandle[] files, Comparator<FileHandle> comparator) {
  		return sortFiles(files, comparator, false);
  	}
docs: Sorts file list, using this rules: directories first, sorted using provided comparator, then files sorted using provided comparator.
  @param files list to sort
  @param comparator comparator used to sort files and directories list
  @return sorted file list