----------------
- Require `zope.testrunner` and remove support for zope.testing 3.7.
[hannosch]
- Added support for `zope.testrunner` while retaining support for the older
`zope.testing.testrunner`.
[hannosch]
- No longer use the deprecated `zope.testing.doctest`.
[hannosch]
- Distribution metadata cleanup.
[hannosch]
- Use built-in `xml.etree` in favor of `elementree` in Python 2.5+ and added
missing dependency on `zc.recipe.egg`.
[multani]