loongson/pypi: links for scrapy-twostage

loongson/mirror scrapy-twostage-0.0.4.tar.gz
loongson/mirror scrapy-twostage-0.0.3.tar.gz
loongson/mirror scrapy-twostage-0.0.2.tar.gz
loongson/mirror scrapy-twostage-0.0.1.tar.gz