Stop pip from failing on single package when installing with requirements.txt

UNIX:

cat requirements.txt | xargs -n 1 pip install

WINDOWS

FOR /F %k in (requirements.txt) DO ( if NOT # == %k ( pip install %k ) )

REF: https://stackoverflow.com/questions/22250483/stop-pip-from-failing-on-single-package-when-installing-with-requirements-txt