Multiple apps: Sort imports and minor style fixes

Signed-off-by: Roberto Rosario <Roberto.Rosario@mayan-edms.com>

mayan/apps/document_comments/migrations/0001_initial.py

@@ -1,8 +1,7 @@
-# -*- coding: utf-8 -*-
 from __future__ import unicode_literals
 
-from django.db import models, migrations
 from django.conf import settings
+from django.db import migrations, models
 
 
 class Migration(migrations.Migration):

mayan/apps/document_comments/migrations/0002_auto_20150729_2144.py

@@ -1,7 +1,6 @@
-# -*- coding: utf-8 -*-
 from __future__ import unicode_literals
 
-from django.db import models, migrations
+from django.db import migrations, models
 
 
 class Migration(migrations.Migration):

mayan/apps/document_comments/migrations/0003_auto_20150729_2144.py

@@ -1,8 +1,7 @@
-# -*- coding: utf-8 -*-
 from __future__ import unicode_literals
 
-from django.db import migrations
 from django.conf import settings
+from django.db import migrations
 
 
 def migrate_old_comments(apps, schema_editor):
@@ -23,7 +22,9 @@ def migrate_old_comments(apps, schema_editor):
 
         for old_comment in OldComment.objects.using(schema_editor.connection.alias).all():
             comment = Comment(
-                document=Document.objects.using(schema_editor.connection.alias).get(pk=old_comment.object_pk),
+                document=Document.objects.using(
+                    schema_editor.connection.alias
+                ).get(pk=old_comment.object_pk),
                 user=User(old_comment.user.pk),
                 comment=old_comment.comment,
                 submit_date=old_comment.submit_date,

mayan/apps/document_comments/migrations/0004_auto_20150920_0202.py

@@ -1,7 +1,6 @@
-# -*- coding: utf-8 -*-
 from __future__ import unicode_literals
 
-from django.db import models, migrations
+from django.db import migrations, models
 
 
 class Migration(migrations.Migration):