Re-land: Removed virtualenv from depot_tools

bootstrap/virtualenv/docs/development.rst

Index: bootstrap/virtualenv/docs/development.rst
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-Development
-===========
-
-Contributing
-------------
-
-Refer to the `pip development`_ documentation - it applies equally to
-virtualenv, except that virtualenv issues should filed on the `virtualenv
-repo`_ at GitHub.
-
-Virtualenv's release schedule is tied to pip's -- each time there's a new pip
-release, there will be a new virtualenv release that bundles the new version of
-pip.
-
-Files in the `virtualenv_embedded/` subdirectory are embedded into
-`virtualenv.py` itself as base64-encoded strings (in order to support
-single-file use of `virtualenv.py` without installing it). If your patch
-changes any file in `virtualenv_embedded/`, run `bin/rebuild-script.py` to
-update the embedded version of that file in `virtualenv.py`; commit that and
-submit it as part of your patch / pull request.
-
-.. _pip development: http://www.pip-installer.org/en/latest/development.html
-.. _virtualenv repo: https://github.com/pypa/virtualenv/
-
-Running the tests
------------------
-
-Virtualenv's test suite is small and not yet at all comprehensive, but we aim
-to grow it.
-
-The easy way to run tests (handles test dependencies automatically)::
-
-    $ python setup.py test
-
-If you want to run only a selection of the tests, you'll need to run them
-directly with pytest instead. Create a virtualenv, and install required
-packages::
-
-    $ pip install pytest mock
-
-Run pytest::
-
-    $ pytest
-
-Or select just a single test file to run::
-
-    $ pytest tests/test_virtualenv
-
-Status and License
-------------------
-
-``virtualenv`` is a successor to `workingenv
-<http://cheeseshop.python.org/pypi/workingenv.py>`_, and an extension
-of `virtual-python
-<http://peak.telecommunity.com/DevCenter/EasyInstall#creating-a-virtual-python>`_.
-
-It was written by Ian Bicking, sponsored by the `Open Planning
-Project <http://openplans.org>`_ and is now maintained by a
-`group of developers <https://github.com/pypa/virtualenv/raw/master/AUTHORS.txt>`_.
-It is licensed under an
-`MIT-style permissive license <https://github.com/pypa/virtualenv/raw/master/LICENSE.txt>`_.