Replace __version__.py with __init__.py

Also fixes reporting in sentry.

polymorphic/__init__.py

@@ -6,6 +6,8 @@ Copyright:
 This code and affiliated files are (C) by Bert Constantin and individual contributors.
 Please see LICENSE and AUTHORS for more information.
 """
+# See PEP 440 (https://www.python.org/dev/peps/pep-0440/)
+__version__ = "0.8"
 
 
 # Monkey-patch Django < 1.5 to allow ContentTypes for proxy models.

polymorphic/__version__.py

@@ -1,5 +0,0 @@
-# -*- coding: utf-8 -*-
-"""
-See PEP 440 (https://www.python.org/dev/peps/pep-0440/)
-"""
-__version__ = "0.7.2"

setup.py

@@ -22,7 +22,7 @@ def find_version(*parts):
 
 setup(
     name = 'django_polymorphic',
-    version = find_version('polymorphic', '__version__.py'),
+    version = find_version('polymorphic', '__init__.py'),
     license = 'BSD',
 
     description = 'Seamless Polymorphic Inheritance for Django Models',