New features:
* built as PyPI package with entry point - could install by pip and
use new command `ulozto-downloader`
* automatic CAPTCHA solving using github.com/JanPalasek/ulozto-captcha-breaker
* reusing completed download links for other parts
* support for direct quick download URLs
Fixes:
* adaptation for Uloz.to changes
* waiting 60 seconds for next CAPTCHA try after Uloz.to bounce
Misc:
* major refactoring + support for easy change of CAPTCHA solve function