Log Message:
Update py-test to 2.8.3.

All tests pass.

2.8.3
-----

- fix #1169: add __name__ attribute to testcases in TestCaseFunction to
  support the @unittest.skip decorator on functions and methods.
  Thanks Lee Kamentsky for the PR.

- fix #1035: collecting tests if test module level obj has __getattr__().
  Thanks Suor for the report and Bruno Oliveira / Tom Viner for the PR.

- fix #331: don't collect tests if their failure cannot be reported correctly
  e.g. they are a callable instance of a class.

- fix #1133: fixed internal error when filtering tracebacks where one entry
  belongs to a file which is no longer available.
  Thanks Bruno Oliveira for the PR.

- enhancement made to highlight in red the name of the failing tests so
  they stand out in the output.
  Thanks Gabriel Reis for the PR.

- add more talks to the documentation
- extend documentation on the --ignore cli option
- use pytest-runner for setuptools integration
- minor fixes for interaction with OS X El Capitan
  system integrity protection (thanks Florian)