sphinx/tests/test_quickstart.py:221: DeprecationWarning: invalid escape sequence '\*'
    content = filename.bytes().decode('unicode-escape')
  sphinx/tests/test_quickstart.py:221: DeprecationWarning: invalid escape sequence '\`'
    content = filename.bytes().decode('unicode-escape')

The default values of them are same as conf.py's. So it is not
needed to override the setting.

This is a little more flexible than the existing set up and makes
maximum use of argparse capabilities.

This has the side-effect of no longer including configuration for the
'sphinx.ext.todo' extension when said extension is not enabled.

Signed-off-by: Stephen Finucane <stephen@that.guru>

The 'd' and 'key' values are used on a single line. Move these outside
the function to allow us to do other things with this function.

Signed-off-by: Stephen Finucane <stephen@that.guru>

We're going to move the executable's here (or at least those that part
of the core library). The 'sphinx-build' executable was already moved,
so lets do 'sphinx-quickstart' next.

To avoid breaking packages that are using this feature directly, aliases
for the old 'main' method are included. This is based on what Django
does [1] and, like Django, will allow us to safely remove the old
modules in Sphinx 2.0.

[1] https://github.com/django/django/blob/1.11/django/test/runner.py#L688-L695

Signed-off-by: Stephen Finucane <stephen@that.guru>