Setup.py is broken

[olivierdalang]

pip-installing doesn't work as setup.py is broken, leading to following errors :

ImportError: No module named lxml.html.clean
since setup.py doesn't include lxml (which is in requirements.txt)

Once fixed, there is
AttributeError: 'module' object has no attribute 'ytp_comments/ytp_comments.css'
not exactly sure why, but maybe setup.py doesn't correctly include some static files.