--- fixes: - The ``yum-minimal`` element now correctly strips locale-archive files, but leaves en.US/en.US-UTF8 for compatibility with remote access. Better failure detection has been added to avoid leaving lock files behind if initial installs to the chroot fail. - The ``epel`` element was fixed to not incorrectly install EPEL6 on Centos 7. EPEL is added as a requirement of ``centos-minimal`` (previously, it was tacitly required but not expressed). - The ``dib-lint`` tool is now more verbose, has better documentation and more correctly detects errors in JSON & YAML. - The ``ironic-agent`` element no longer removes the ``sudo`` package in its cleanup phase.