Merge pull request #65 from kmike/py3-no-cython

PY3 fixed installation without Cython

Author: lmcinnes

setup.py

@@ -5,7 +5,7 @@
     from setuptools import setup, Extension
     HAVE_CYTHON = True
 except ImportError as e:
-    warnings.warn(e.message)
+    warnings.warn(e.args[0])
     from setuptools import setup, Extension
     from setuptools.command.build_ext import build_ext
     HAVE_CYTHON = False