This is a douban book review spider, using scrapy.
#豆瓣书评爬虫
这个爬虫，是按照时间顺序爬取书评，每次爬取5篇
每次爬取5篇，通过setting.py中的CLOSESPIDER_ITMECOUNT设定
用basicspider来写。
##遇到的错误合集
页面会request两遍。因为在url最后少加了一个\，导致会多一次跳转
遇到404页面爬虫会终止。在spider中添加了handle_httpstatus_list=[404]
Spider must return Request, BaseItem, dict or None错误的使用yeild做最后的itme返回。
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