0.4.0

• Fix incorrect match reporting level (files vs. lines) in some cases
• Fix incorrect line match reporting despite of match preconditions not satisfied
• Fix first parser eating away first character of exclude regexps
• Improve ruleset syntax
  • Don't use backslash escaping in rule titles, literal ] may now be written as ]]
  • Don't use backslash escaping in regexps - it's not really needed as (almost) any framing characters are allowed
  • Support unicode framing characters in regexps
  • Disallow brackets as regexp framing characters to avoid confusion
• Implement parsed config dumping (may be useful in future for config format migration)
• Allow to delimit tags with commas in CLI (--ignore-tags=foo,bar,baz)
• Make tags case insensitive
• Improve glob and regexp matching performance
• Don't panic with unhelpful message when non-directory is specified as root
• No longer rely on rust unstable features and thus require rust nightly
• Make some features conditionally compiled