Use more current ez_setup url.

bootstrap/bootstrap.py

@@ -75,9 +75,7 @@ except ImportError:
     except ImportError:
         from urllib2 import urlopen
 
-    # XXX use a more permanent ez_setup.py URL when available.
-    exec(urlopen('https://bitbucket.org/pypa/setuptools/raw/0.7.2/ez_setup.py'
-                ).read(), ez)
+    exec(urlopen('https://bootstrap.pypa.io/ez_setup.py').read(), ez)
     setup_args = dict(to_dir=tmpeggs, download_delay=0)
     ez['use_setuptools'](**setup_args)