Merge branch 'kn/gitweb-extra-branch-refs'

Allow gitweb to be configured to show refs out of refs/heads/ as if they were branches. * kn/gitweb-extra-branch-refs: gitweb: Denote non-heads, non-remotes branches gitweb: Add a feature for adding more branch refs gitweb: Return 1 on validation success instead of passed input gitweb: Move check-ref-format code into separate function