update nodejs_test
init of js algorithm
Merge branch 'master' of https://github.com/KennF/Circus
This is a simple demo how to use Scrapy to crawl a website - learn:
a) setup a Scrapy project - scrapy startproject [project name]
b) add spider under spiders folder, basically implement spider class inherits scrapy.Spider and the parse() function, which process the request and yield Item or Request
    Item - could be processed pipeline
    Request - push back to requests queue
c) define the subclass of Item, which is quite similar to ORM to serialize the scrapped data
d) scrapy command line
    scrapy shell 'url'  -- start the scrapy in shell and can use response.xpath('') to parse/debug
    scrapy crawl [spider name] -- start the crawl
    scrapy crawl [spider name] -o items.json  -- serialize scrapped data into json file

One useful passage - [Scrapy by Free Mind](http://blog.pluskid.org/?p=366)