Release 0.1.20 - add tar as an output type - yum: support pkg-map in bin/install-packages - rename old image file instead of rewrite it - reinstate Trusty as default for Ubuntu - only use Ec2 cloud-init data source for Ubuntu (bug 1316475) - check return code of element-info - correct the wrong rename in rhel element - add new cloud-init-datasources element (bug 1316475) - tidy up SuSE kernel selection - parameterise PXE kernel and initrd selection - debian: Support additional debootstrap arguments