* matcher: Add `split_path` option to file matcher; used in php_fastcgi
* matcher: Skip try_files split if not the final part of the filename
* matcher: Add MatchFile tests
* matcher: Clarify SplitPath godoc
* docs: Pull contributing document from v1 branch
* Update .github/CONTRIBUTING.md
Co-Authored-By: Matt Holt <mholt@users.noreply.github.com>
* docs: [Responsible -> Coordinated] Disclosure
* docs: Link to the new security policy page
Co-authored-by: Matt Holt <mholt@users.noreply.github.com>