forum: add favorite topics

Signed-off-by: Skia <skia@libskia.so>

forum/migrations/0005_forumtopic_subscribed_users.py

@@ -0,0 +1,21 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+from django.conf import settings
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+        ('forum', '0004_auto_20170531_1949'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='forumtopic',
+            name='subscribed_users',
+            field=models.ManyToManyField(verbose_name='subscribed users', related_name='favorite_topics', to=settings.AUTH_USER_MODEL),
+        ),
+    ]