remove crontab2english.pl and references to it for FSDG reasons

As per leny2010/package-helpers#5

helpers/make-cron

+#!/bin/sh
+#
+#    Copyright (C) 2014 Andrew M. Lindley <andrew@andrewlindley.co.uk>
+#
+#    This program is free software; you can redistribute it and/or modify
+#    it under the terms of the GNU General Public License as published by
+#    the Free Software Foundation; either version 2 of the License, or
+#    (at your option) any later version.
+#
+#    This program is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU General Public License for more details.
+#
+#    You should have received a copy of the GNU General Public License
+#    along with this program; if not, write to the Free Software
+#    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
+#
+
+VERSION=1
+
+. ./config
+
+rm debian/examples/crontab2english.pl 
+
+sed '/crontab2english.pl/,/License: Artistic/d;/License: Artistic/,/common-licenses/d' -i debian/copyright 
+
+changelog "Removed non-free example #10868"
+
+compile
+