First-draft release notes for next week's back-branch releases

If you're not tired of reviewing release notes (I'm sure getting a bit
tired of writing them), see

http://git.postgresql.org/gitweb/?p=postgresql.git;a=commitdiff;h=eb7de00ac2d282263541ece849ec71e2809e9467

guaibasaurus should have 'em up on the web in an hour or so, too, at

http://www.postgresql.org/docs/devel/static/release-9-5-3.html
        regards, tom lane