Fixed python code block formatting in installation file

docs/installation.rst

@@ -100,27 +100,29 @@ If you don't already have a custom Profile model, simply uses the provided model
 
 Be sure to run manage.py syncdb after setting this up.
 
-Otherwise Django Facebook provides an abstract model which you can inherit like this::
-
-from django.db import models
-from django.dispatch.dispatcher import receiver
-from django_facebook.models import FacebookModel
-from django.db.models.signals import post_save
-from django_facebook.utils import get_user_model, get_profile_model
-from your_project import settings
-
-
-class MyCustomProfile(FacebookModel):
-  user = models.OneToOneField(settings.AUTH_USER_MODEL)
-
-@receiver(post_save)
-def create_profile(sender, instance, created, **kwargs):
-  """Create a matching profile whenever a user object is created."""
-  if sender == get_user_model():
-    user = instance
-    profile_model = get_profile_model()
-    if profile_model == MyCustomProfile and created:
-      profile, new = MyCustomProfile.objects.get_or_create(user=instance)
+Otherwise Django Facebook provides an abstract model which you can inherit like this
+
+.. code-block:: python
+
+  from django.db import models
+  from django.dispatch.dispatcher import receiver
+  from django_facebook.models import FacebookModel
+  from django.db.models.signals import post_save
+  from django_facebook.utils import get_user_model, get_profile_model
+  from your_project import settings
+
+
+  class MyCustomProfile(FacebookModel):
+      user = models.OneToOneField(settings.AUTH_USER_MODEL)
+
+  @receiver(post_save)
+  def create_profile(sender, instance, created, **kwargs):
+      """Create a matching profile whenever a user object is created."""
+      if sender == get_user_model():
+          user = instance
+          profile_model = get_profile_model()
+          if profile_model == MyCustomProfile and created:
+              profile, new = MyCustomProfile.objects.get_or_create(user=instance)
 
 Remember to update AUTH_PROFILE_MODULE in settings to your new profile.
 Don't forget to update your database using syncdb or south after this step.