[changed]
- `core.setup_config` function is changed to `config.setup_config`.
[added]
- added `utils.trace` decorator, which will **print** *function_name*, *args*, *kwargs* and *return value* when debug config key is True.
- new html-parsers ('html5lib', 'lxml') are supported for better webpages.
- html-parser is now defaulted to 'lxml'. You can use any through new `config.config` key called `parser`
[fixed]
- fixed issue while changing `user-agent` key cracked webpages. You can now use any browser's user-agent id and it will get exact same page downloaded.
- fixed issue in `generators.extract_css_urls` which was caused by `str` and `bytes` difference in python3.
- fixed issues in modules importing. (Thanks "**Илья Игоревич**").
- added `errorhandling` to required functions