Node package

[nrbrd]

PR Overview

This PR adds the node package helper.

[codecov-io]

Current coverage is 88.21% (diff: 100%)

Merging #10 into master will not change coverage

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[nrbrd]

This PR is ready to be reviewed.
This adds the Node.js Scrapy Streaming package.

Installing

Navigate to the scrapy-streaming/helpers/nodejs folder and type:

sudo npm install . -g

and then you can load it using:

node
> var scrapy = require('scrapystreaming');

Examples

You can find some examples at #4

Docs

You can read the docs at #7 , and here: http://gsoc2016.readthedocs.io/en/latest/js_node.html

cc: @eLRuLL