refactor: use onBindViewHolder(RecyclerView.ViewHolder holder, int po…

…sition, List<Object> payloads)

feat: auto load more when no data is initialized

demo: another usage and to reproduce #9

feat: support show no more view #3

新增方法：获取原来的adapter，Merge pull request #1

update

fix: problem when item changed

fix: problem when notifyItemInserted(0)

support load more when item is not fully covered of screen