scrapy memo

http://heppoko.hatenadiary.jp/entry/2015/03/07/141509
http://blog.livedoor.jp/kmiwa_project/archives/1028960463.html
http://qiita.com/meltest/items/b445510f09d81276a420
http://orangain.hatenablog.com/entry/scrapy1.0
http://akiniwa.hatenablog.jp/entry/2013/04/15/001411