models: UngleichPage, -image_header +image

The filed image_header was removed, and
a new filed image was added, the reason
for this change is that image being a
FilerImageFiled can make use of previously
uploaded images while with image_header only
uploads where available.

Signed-off-by: rscnt <rascnt@gmail.com>

ungleich/migrations/0003_remove_ungleichpage_image_header.py

@@ -0,0 +1,18 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import models, migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('ungleich', '0002_ungleichpage_image'),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name='ungleichpage',
+            name='image_header',
+        ),
+    ]