[bugfix] added missing __init__.py.

python/dune/__init__.py

+__import__('pkg_resources').declare_namespace(__name__)

python/setup.py.in

@@ -3,7 +3,7 @@ from setuptools import setup, find_packages
 setup(name="dune.femdg",
     namespace_packages=['dune'],
     description="Python lib for dune: dune-fem-dg header library",
-    version="${DUNE_PYTHON_VERSION}",
+    version="${DUNE_FEM_DG_VERSION}",
     author="Robert Kloefkorn, Andreas Dedner, Tobias Malkmus, Stefan Wierling (geb. Girke)",
     packages = find_packages(),
     zip_safe = 0,