Updated py-test to 3.0.7.

3.0.7 (2017-03-14)
==================

* Fix issue in assertion rewriting breaking due to modules silently discarding
  other modules when importing fails
  Notably, importing the `anydbm` module is fixed. (`#2248`_).
  Thanks `@pfhayes`_ for the PR.

* junitxml: Fix problematic case where system-out tag occured twice per testcase
  element in the XML report. Thanks `@kkoukiou`_ for the PR.

* Fix regression, pytest now skips unittest correctly if run with ``--pdb``
  (`#2137`_). Thanks to `@gst`_ for the report and `@mbyt`_ for the PR.

* Ignore exceptions raised from descriptors (e.g. properties) during Python test collection (`#2234`_).
  Thanks to `@bluetech`_.

* ``--override-ini`` now correctly overrides some fundamental options like ``python_files`` (`#2238`_).
  Thanks `@sirex`_ for the report and `@nicoddemus`_ for the PR.

* Replace ``raise StopIteration`` usages in the code by simple ``returns`` to finish generators, in accordance to `PEP-479`_ (`#2160`_).
  Thanks `@tgoodlet`_ for the report and `@nicoddemus`_ for the PR.

* Fix internal errors when an unprintable ``AssertionError`` is raised inside a test.
  Thanks `@omerhadari`_ for the PR.

* Skipping plugin now also works with test items generated by custom collectors (`#2231`_).
  Thanks to `@vidartf`_.

* Fix trailing whitespace in console output if no .ini file presented (`#2281`_). Thanks `@fbjorn`_ for the PR.

* Conditionless ``xfail`` markers no longer rely on the underlying test item
  being an instance of ``PyobjMixin``, and can therefore apply to tests not
  collected by the built-in python test collector. Thanks `@barneygale`_ for the
  PR.

(wiz)