Roll virtualenv 12.0->15.0.2

bootstrap/virtualenv/README.rst

+virtualenv
+==========
+
+A tool for creating isolated 'virtual' python environments.
+
+.. image:: https://img.shields.io/pypi/v/virtualenv.svg
+        :target: https://pypi.python.org/pypi/virtualenv
+
+.. image:: https://img.shields.io/travis/pypa/virtualenv/develop.svg
+   :target: http://travis-ci.org/pypa/virtualenv
+
+* `Installation <https://virtualenv.pypa.io/en/latest/installation.html>`_
+* `Documentation <https://virtualenv.pypa.io/>`_
+* `Changelog <https://virtualenv.pypa.io/en/latest/changes.html>`_
+* `Issues <https://github.com/pypa/virtualenv/issues>`_
+* `PyPI <https://pypi.python.org/pypi/virtualenv/>`_
+* `Github <https://github.com/pypa/virtualenv>`_
+* `User mailing list <http://groups.google.com/group/python-virtualenv>`_
+* `Dev mailing list <http://groups.google.com/group/pypa-dev>`_
+* User IRC: #pypa on Freenode.
+* Dev IRC: #pypa-dev on Freenode.
+
+
+Code of Conduct
+---------------
+
+Everyone interacting in the virtualenv project's codebases, issue trackers,
+chat rooms, and mailing lists is expected to follow the
+`PyPA Code of Conduct`_.
+
+.. _PyPA Code of Conduct: https://www.pypa.io/en/latest/code-of-conduct/