mod_md v0.8.2

• All files necessary to run tests are not in the release package.
• Making "http-01" the preferred challenge type again, as people "tls-sni-01" requires at least
  one working certificate vhost right now - which not everyone has.
• moved part of the MD sanity checks from post_config to check_config phase, allowing for error
  detection in check-only runs.