Updated py-setuptools to 30.4.0.

v30.4.0
-------

* #879: For declarative config:
  - read_configuration() now accepts ignore_option_errors argument. This allows scraping tools to read metadata without a need to download entire packages. E.g. we can gather some stats right from GitHub repos just by downloading setup.cfg.
  - packages find: directive now supports fine tuning from a subsection. The same arguments as for find() are accepted.

v30.3.0
-------

* #394 via #862: Added support for `declarative package
  config in a setup.cfg file
  <http://setuptools.readthedocs.io/en/latest/setuptools.html#configuring-setup-using-setup-cfg-files>`_.

v30.2.1
-------

* #850: In test command, invoke unittest.main with
  indication not to exit the process.

v30.2.0
-------

* #854: Bump to vendored Packaging 16.8.

v30.1.0
-------

* #846: Also trap 'socket.error' when opening URLs in
  package_index.

* #849: Manifest processing now matches the filename
  pattern anywhere in the filename and not just at the
  start. Restores behavior found prior to 28.5.0.

v30.0.0
-------

* #864: Drop support for Python 3.2. Systems requiring
  Python 3.2 support must use 'setuptools < 30'.

* #825: Suppress warnings for single files.

* #830 via #843: Once again restored inclusion of data
  files to sdists, but now trap TypeError caused by
  techniques employed rjsmin and similar.

(wiz)