dotcloud/docker — pull request #2039 by tianon (2013-09-28 13:57:58+00:00)
Title: Add contrib/mkimage-centos.sh back (from #1621), and associated documentation link

Somewhere between #1621 and #1703, we lost `contrib/mkimage-centos.sh` (thanks to @dsissitka for pointing it out and for finding the relevant issues to resurrect it).