from Dennis Gilmore <dennis@ausil.us>:
    
      - setup support so loopback devices can work [RHBZ#1245401]
    - from Miroslav Suchý <msuchy@redhat.com>:
      - clarify path [RHBZ#1228751]
      - document target_arch and legal_host_arches in site-defaults.cfg [RHBZ#1228751]
      - document "yum.conf" in site-defaults.cfg [RHBZ#1228751]
      - correctly specify requires of yum [RHBZ#1244475]
      - bump up releasever in rawhide targets
      - remove EOLed gpg keys
      - add f23 configs
      - removing EOLed f19 and f20 configs