Updated py-setuptools to 25.1.1.

v25.1.1
-------

* #686: Fix issue in sys.path ordering by pkg_resources when
  rewrite technique is "raw".
* #699: Fix typo in msvc support.

v25.1.0
-------

* #609: Setuptools will now try to download a distribution from
  the next possible download location if the first download fails.
  This means you can now specify multiple links as ``dependency_links``
  and all links will be tried until a working download link is encountered.

v25.0.2
-------

* #688: Fix AttributeError in setup.py when invoked not from
  the current directory.

v25.0.1
-------

* Cleanup of setup.py script.

* Fixed documentation builders by allowing setup.py
  to be imported without having bootstrapped the
  metadata.

* More style cleanup. See #677, #678, #679, #681, #685.

(wiz)