Remove __version__ from django_browserid.__init__.

Importing django_browserid from setup.py causes errors due to
dependencies on django.conf in files imported by __init__.
Since the only need for the import is the version number,
we can just embed that directly in setup.py and remove the import.
Fixes mozilla#31.

django_browserid/__init__.py

@@ -1,6 +1,2 @@
 from django_browserid.auth import BrowserIDBackend
 from django_browserid.base import get_audience, verify
-
-
-VERSION = (0, 1)
-__version__ = '.'.join(map(str, VERSION))

setup.py

@@ -1,11 +1,8 @@
 from setuptools import setup
 
-import django_browserid
-
-
 setup(
     name='django-browserid',
-    version=django_browserid.__version__,
+    version='0.2',
     packages=['django_browserid'],
     author="Paul Osman",
     author_email="paul@mozillafoundation.org",