It seems that pytest-cov does not collect any coverage without
this file.

Signed-off-by: Adam Williamson <awilliam@redhat.com>

`clientlogin()` does `self.require(1, 27)`, which needs the site
instance's `version` attribute to be set, but this is usually
done by `site_init()`, which is mocked out in the tests. We can
fix the problem by just manually setting a sufficiently high
version in the tests.

Signed-off-by: Adam Williamson <awilliam@redhat.com>

Allow specifying `uselang` with `Page.revisions()` and
`Site.usercontributions()` to get localized parsed comments with
`prop=parsedcomment`.

Breaking change: Change the `Site.ask()` method to produce less nested
output. Basically, change `yield {title: answer}` to `yield answer`. The
title is included in the answer object after all.

The rvexpandtemplates parameter has been removed, but we can use
action=expandtemplates instead.

This fixes tests not being added to the source package.