- Removed support for Zope generations. It was not used and application-wide
  generations make more sense anyways. This removed the
  ``zope.app.generations`` and ``zope.generations`` dependencies.

- Made ``z3c.configurator`` support optional.

- Cleaned up source code a little bit.
Preparing release 1.0.0a4
Back to development: 1.0.0a5