update docs now devel-4-pungi is merged to master, minor spelling fixes
    
      (pbrobinson)
    - Fix remaining productmd issues. (dmach)
    - Revert "refactor metadata.py to use productmd's compose.dump for composeinfo"
      (dmach)
    - Fix LoraxTreeInfo class inheritance. (dmach)
    - Fix pungi -> pungi_wrapper namespace issue. (dmach)
    - fix arg order for checksums.add (admiller)
    - update for productmd checksums.add to TreeInfo (admiller)
    - fix product -> release namespace change for productmd (admiller)
    - update arch manifest.add config order for productmd api call (admiller)
    - update for new productmd named args to rpms (admiller)
    - fix pungi vs pungi_wrapper namespacing in method_deps.py (admiller)
    - add createrepo_c Requires to pungi.spec (admiller)
    - add comps_filter (admiller)
    - refactor metadata.py to use productmd's compose.dump for composeinfo instead
      of pungi compose_to_composeinfo (admiller)
    - Update compose, phases{buildinstall,createiso,gather/__ini__} to use correct
      productmd API calls (admiller)
    - Use libselinux-python instead of subprocess (lmacken)
    - Add README for contributors (admiller)