[rdo-list] [TripleO] How to build disk images?

Hi all, I need to update an image in the tripleo-puppet-elements repository[0]. More precisely, I need to update "overcloud-network-midonet". Before pushing changes upstream I would like to build and test the images locally, but I'm having issues finding documentation to do so. I found a tripleo-incubator doc[1], but I'm not sure this is what I'm looking for, or if it is indeed outdated. Or is there another way to build the images? Also, the README in [0] does not work. Can you please point me in the right direction here? Best regards, Alejandro Andreu [0]: https://github.com/openstack/tripleo-puppet-elements [1]: http://docs.openstack.org/developer/tripleo-incubator/puppet.html