add tgz and upload script to contrib

contrib/make_tgz

@@ -0,0 +1 @@
+python3 setup.py sdist --format=zip,gztar

contrib/upload

@@ -0,0 +1,17 @@
+#!/bin/bash
+
+set -e
+
+version=`git describe --tags`
+echo $version
+
+here=$(dirname "$0")
+cd $here/../dist
+
+sftp -oBatchMode=no -b - thomasv@download.electrum.org << !
+   cd electrum-downloads
+   mkdir $version
+   cd $version
+   mput *
+   bye
+!