Crawlab-sdk

Features / Enhancement
- **Added Node.js SDK**.

Bug Fixes

Features / Enhancement

Bug Fixes
- **"crawlab spiders" error**. [Crawlab 458](https://github.com/crawlab-team/crawlab/issues/458)

Features / Enhancement
- **Integration with Scrapy**. Allow users to use crawlab.pipelines.CrawlabMongoPipeline to integrate Scrapy spiders with Crawlab.
- **Integration with General Python Spiders**. Allow users to use crawlab.save_item method to integrate general Python spiders with Crawlab.

Bug Fixes

Features / Enhancement
- **CLI**. Allow users to interact with Crawlab server such as uploading spiders and viewing list of nodes, spiders and tasks.