code: public List<O> getItems(int count, int offset) {
          return getDatastore().find(clazz).offset(offset).limit(count).asList();
      }
docs: A helper method used for paging
  Example: for offset=5 and count=10, this method will return items 5 to 15
  
  @param count,  the number of items to retrieve
  @param offset, the initial offset
  @return