Ezweb

**Full Changelog**: https://github.com/mdmomeni/ezweb/compare/3.0.0...4.0.0

- Introducing `EzSource` to separate the source information of a web content
- Algorithm improvements and some structure changes
- Bug fixes

**Full Changelog**: https://github.com/mdmomeni/ezweb/compare/2.0.0...3.0.0

Structure
- Initial `docs` directory
EzProduct:
- Algorithm improvements for finding main product card
EzSoup:
- `from_structured_data` change `single` parameter to `multiple` (it's reversed now)
- Change `main_text_comments` to `comments_text`

- `EzProduct` development
- Add site map helpers (beta)
- Some algorithm improvements