use setuptools (#33)

setup from distutils is deprecated and will be removed eventually.
It already breaks on Debian testing.

Author: v4hn

setup.py

@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 
-from distutils.core import setup
+from setuptools import setup
 from catkin_pkg.python_setup import generate_distutils_setup
 
 d = generate_distutils_setup(