Add helper to migrate from south to Django 1.7 (bug #526)

Signed-off-by: Michal Čihař <michal@cihar.com>

examples/migrate-south

+#!/bin/sh
+set -e
+
+TMPDIR=$(mktemp -d)
+trap "rm -rf -- '$TMPDIR'" EXIT HUP INT TERM
+
+virtualenv --system-site-packages "$TMPDIR"
+. "$TMPDIR/bin/activate"
+
+pip install django==1.6.5
+pip install south
+
+CMD="$(command -v django-admin)"
+python "$CMD" migrate "$@"