Whitespace cleanup.

* Removed trailing whitespace.
* Added newline to EOF if missing.
* Removed blank lines at EOF.
* Removed some stray tabs.

tests/custom_pk/models.py

@@ -45,4 +45,3 @@ class Bar(models.Model):
 
 class Foo(models.Model):
     bar = models.ForeignKey(Bar)
-