Added

• Set previousUrl to onSuccess argument.
• Set options, depth, previousUrl to errors.
• Support customCrawl for HCCrawler.connect() and HCCrawler.launch()'s options.
• Add Dockerfile and tips for using Docker.

Changed

• Drop newpage event.
• Update Puppeteer version to 1.5.0.

Fixed

• Fix a bug of not marking skipped requests correctly.
• Fix requestfinished event's argument as described in the API reference.