a python web crawler based on scrapy to grab data from lagou.com

1. install mongodb, run it with wiretiger engine
2. install python2.7, scrapy
3. run scrapy crawl main_menu first
4. run scrapy crawl jobs second
5. run scrapy crawl details third
6. fork it if you want to extend the project, like get all job details, which is I'm going to do next.