Add migrations to the tests.sandbox.pages app

This fixes tests

tests/sandbox/pages/migrations/0001_initial.py

@@ -0,0 +1,31 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.1 on 2017-05-31 06:50
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+import django.db.models.deletion
+import wagtail.wagtailcore.fields
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+        ('wagtail_personalisation', '0008_devicerule'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='HomePage',
+            fields=[
+                ('personalisablepage_ptr', models.OneToOneField(auto_created=True, on_delete=django.db.models.deletion.CASCADE, parent_link=True, primary_key=True, serialize=False, to='wagtail_personalisation.PersonalisablePage')),
+                ('subtitle', models.CharField(max_length=255)),
+                ('body', wagtail.wagtailcore.fields.RichTextField(blank=True, default='')),
+            ],
+            options={
+                'abstract': False,
+            },
+            bases=('wagtail_personalisation.personalisablepage',),
+        ),
+    ]