Import and PEP8 cleanups

apps/installation/__init__.py

@@ -5,13 +5,12 @@ from south.signals import post_migrate
 from project_tools.api import register_tool
 
 from django.dispatch import receiver
-from django.db.models.signals import post_save
 from django.db.utils import DatabaseError
 from django.db import transaction
 
 from .links import installation_details
 from .models import Installation
-    
+
 
 @receiver(post_migrate, dispatch_uid='trigger_first_time')
 def trigger_first_time(sender, **kwargs):
@@ -27,7 +26,7 @@ def check_first_run():
         details = Installation.objects.get()
     except DatabaseError:
         # Avoid database errors when the app tables haven't been created yet
-        transaction.rollback()        
+        transaction.rollback()
     else:
         if details.is_first_run:
             details.submit()