Enable Python3 support in setup.py .

setup.py

 from os.path import join, exists
 from setuptools import setup, find_packages
 import hashlib
+import os
 import sys
-import urllib
+extra = {}
+if sys.version_info >= (3, ):
+  extra['use_2to3'] = True
+  from urllib.request import urlretrieve
+else:
+  from urllib import urlretrieve
 
 FLOT_SHA = 'aefe4e729b2d14efe6e8c0db359cb0e9aa6aae52'
 FLOT_AXISLABELS_SHA = '80453cd7fb8a9cad084cf6b581034ada3339dbf8'
@@ -38,8 +44,8 @@ _file_dirname = os.path.dirname(__file__)
 def download(url, filename, hexdigest):
   filename = join(_file_dirname, 'apachedex', filename)
   if not exists(filename):
-    urllib.urlretrieve(url, filename)
-  if hashlib.md5(open(filename).read()).hexdigest() != hexdigest:
+    urlretrieve(url, filename)
+  if hashlib.md5(open(filename, 'rb').read()).hexdigest() != hexdigest:
     raise EnvironmentError('Checksum mismatch downloading %r' % filename)
 
 for filename, (url, hexdigest) in DEPS.items():
@@ -54,7 +60,7 @@ description = open(join(_file_dirname, 'README')).read()
 setup(
   name='APacheDEX',
   version='1.3.2',
-  description=(x for x in description.splitlines() if x.strip()).next(),
+  description=next(x for x in description.splitlines() if x.strip()),
   long_description=".. contents::\n\n" + description,
   author='Vincent Pelletier',
   author_email='vincent@nexedi.com',
@@ -66,6 +72,7 @@ setup(
     'License :: OSI Approved :: GNU General Public License v2 or later (GPLv2+)',
     'Operating System :: OS Independent',
     'Programming Language :: Python :: 2.7',
+    'Programming Language :: Python :: 3',
     'Programming Language :: Python :: Implementation :: PyPy',
     'Programming Language :: Python :: Implementation :: CPython',
     'Topic :: System :: Logging',
@@ -79,7 +86,8 @@ setup(
     ],
   },
   package_data={
-    'apachedex': DEPS.keys() + ['apachedex.js', 'apachedex.css'],
+    'apachedex': list(DEPS.keys()) + ['apachedex.js', 'apachedex.css'],
   },
   zip_safe=True,
+  **extra
 )