root/pypi: links for upfront-simplereferencefield

root/pypi upfront.simplereferencefield-0.5.1.tar.gz
root/pypi upfront.simplereferencefield-0.5.tar.gz
root/pypi upfront.simplereferencefield-0.5-py2.6.egg
root/pypi upfront.simplereferencefield-0.5-py2.4.egg