Merge branch 'jn/post-receive-utf8'

Update post-receive-email script to make sure the message contents and pathnames are encoded consistently in UTF-8. * jn/post-receive-utf8: hooks/post-receive-email: set declared encoding to utf-8 hooks/post-receive-email: force log messages in UTF-8 hooks/post-receive-email: use plumbing instead of git log/show