Remove pytest-runner integration (#47)

`pytest-runner` describes itself as deprecated in its own package
description, referring to
https://github.com/pypa/setuptools/issues/1684.  Using it in
`setup_requires` means that any other package that depends on Paste has
to install `pytest-runner` too, which is fairly heavyweight and
unnecessary.  (I ran into this when trying to update Launchpad to a less
ancient version of Paste.)

This does mean that `python setup.py test` no longer works, but,
according to the setuptools issue above, that's deprecated anyway.
Paste already has `tox` configuration that works well.

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