Plone-app-async

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- First public release.
[ggozad]

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- Instead of guessing where a userid may be coming from, record the path
of the userfolder and use that to reinstate the user.
[mj]

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- Use multi-db setup in tests to keep testcaselayer working as expected.
[stefan, ggozad]

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- Separate helper function from test setup so it can be used in non-test code.
[witsch]

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- Made separate zcml configurations for single/multi and instance/worker.
[stefan, ggozad]

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- zc.async integration for Plone. Initial release.
[ggozad, stefan]