add perl-fmt script

contrib/perl-fmt

+#!/usr/bin/env perl
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+#
+# This Source Code Form is "Incompatible With Secondary Licenses", as
+# defined by the Mozilla Public License, v. 2.0.
+
+use 5.10.1;
+use strict;
+use warnings;
+
+use File::Basename qw(dirname);
+use Cwd qw(realpath);
+use File::Spec::Functions qw(catfile catdir);
+use Env qw(@PATH @PERL5LIB);
+
+my $bugzilla_dir = realpath(catdir( dirname(__FILE__), '..' ));
+unshift @PERL5LIB, catdir($bugzilla_dir, 'local', 'lib', 'perl5');
+unshift @PATH, catdir($bugzilla_dir, 'local', 'bin');
+
+my $profile = catfile($bugzilla_dir, ".perltidyrc" );
+warn "formatting @ARGV\n";
+exec( perltidy => "--profile=$profile", '-nst', '-b', '-bext=/', '-conv', @ARGV );