v2.4.0

• Improve configuration files:
  • YAML is now the preferred configuration file format.
  • Add support for JSON config files (JavaScript-style comments allowed) (#89)
  • Use wsgidav.yaml, wsgidav.json, or wsgidav.conf by default if they exist in the local folder
• Expand '~' in --root and --config command line options
• #97: Fix assumption that QUERY_STRING is in environment (dir_browser)
• #99: Fix virtual_dav_provider for Py3: WSGI expects binary instead of str
• #100: Send ETags with PUT response
• #101: Fail cleanly if trying to PUT to unknown collection
• Refactor logging:
  • Re-define verbosity level range: 0..5
  • Remove usage of print in favor of logging.getLogger().debug
  • Remove util.note(), .status(), ... helpers
• Refactor code base:
  • Use .format() syntax instead of %s for string templating
  • Mandatory PEP 8 compliance (checked by flake8)
• Rework documentation on Read The Docs
• MSI setup uses Cheroot version 6.2+