use setuptools if present

Author: djsutherland

setup.py

@@ -24,7 +24,10 @@
 # SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 import sys
-from distutils.core import setup, Extension
+try:
+    from setuptools import setup, Extension
+except ImportError:
+    from distutils.core import setup, Extension
 
 version = '0.5.2'
 long_description = """