git clone https://github.com/stackforge/puppet-heat.git

$ git archive --remote=https://github.com/stackforge/puppet-heat.git
fatal: Operation not supported by protocol.

$  find puppet-heat/ -name '.git' -exec rm -fr {} +

svn export https://github.com/user/project/trunk

git archive --remote=youruser@github.com/stackforge/puppet-heat.git