Rely on setuptools 19.2 for packaging

    exec(compile(source, path, 'exec'), globals(), globals())
  File "/Applications/Nuxeo Drive - Dev/Nuxeo Drive.app/appdata/Nuxeo Drive-2.1.208.macosx-10_10-x86_64/Nuxeo Drive.app/Contents/Resources/ndrive.py", line 9, in <module>
    sys.exit(main())
  File "nxdrive/commandline.pyc", line 737, in main
  File "nxdrive/commandline.pyc", line 456, in handle
  File "nxdrive/commandline.pyc", line 477, in get_manager
  File "nxdrive/manager.pyc", line 269, in __init__
  File "nxdrive/osi/__init__.pyc", line 196, in get
  File "nxdrive/osi/darwin/darwin.pyc", line 13, in <module>
  File "objc/__init__.pyc", line 32, in <module>
  File "objc/_bridgesupport.pyc", line 13, in <module>
  File "pkg_resources/__init__.pyc", line 74, in <module>
  File "pkg_resources/extern/__init__.pyc", line 60, in load_module
ImportError: The 'packaging' package is required; normally this is bundled with this package so if you get this warning, consult the packager of your distribution.