gituser/pypi: links for layerstack

gituser/pypi layerstack-0.4.0.tar.gz
gituser/pypi layerstack-0.3.1.tar.gz
gituser/pypi layerstack-0.3.0.tar.gz
gituser/pypi layerstack-0.2.0.tar.gz
gituser/pypi layerstack-0.1.0.tar.gz