Sbo-selenium

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* Clarify and demonstrate how to successfully run tests via a Docker-based
Selenium server in a virtual machine while using tox.

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* Fixed support for specifying which tests to run on the command line. This
seems to have been broken for Django versions which use argparse to parse
management command options since support was added for them.

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* Added the ``--command-executor`` option for specifying which Selenium server
to use, if not localhost
* Added the ``--docker`` option to automatically start and stop a Docker
container for a standalone Selenium server to be used, and added a few
related Django settings
* Fixed handling of custom parameters to work with recent versions of
django-nose
* Changed monitoring of the Selenium server auto-launching to watch stderr
instead of stdout for the startup complete message, as recent versions of
Selenium seem to have moved the startup output there
* Fixed a bug where the code for timing out attempts to start certain services
(like a standalone Selenium server or Sauce Connect) was taking far longer
than intended to time out

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* Removed the ``-p`` alias for ``--platform``, as it now conflicts with
the ``--plugins`` parameter in the base Django test command
* Fixed support for the underlying test command's standard options under
Django 1.8 and above
* Confirmed compatibility with Django 1.9 and current master
* Fixed a minor incompatibility in ``audit_accessibility()`` with
accessibility developer tools 2.10.1

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* Support accessibility developer tools 2.10.1

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* Support Django 1.7 and 1.8
* Support Python 3 when using Django 1.6 and above
* Removed dependency on nose and django-nose, now also works with the default
Django test runner
* Fixed SELENIUM_DEFAULT_BROWSER behavior (was always defaulting to chrome)
* Added the SELENIUM_TEST_COMMAND_OPTIONS setting