code: public List<File> scan(List<Resource> resources) {
          List<File> files = new ArrayList<File>();
          for (Resource resource: resources) {
              files.addAll(scan(resource));
          }
          return files;
      }
docs: Scans a list of resources returning all AsciiDoc documents found.
  
  @param resources List of {@link Resource} to scan (the directory property is mandatory)
  @return List of found documents matching the resources properties