root/pypi: links for crab

root/pypi crab-0.5.1.tar.gz
root/pypi crab-0.5.0.tar.gz
root/pypi crab-0.4.2.tar.gz
root/pypi crab-0.4.1.tar.gz
root/pypi crab-0.4.0.tar.gz
root/pypi crab-0.3.0.tar.gz
root/pypi crab-0.2.0.tar.gz
root/pypi crab-0.1.0.tar.gz