Lovely-testlayers

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- ServerLayer: reopen logfile in start instead of setUp

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- ServerLayer: generate logfiles with correct file extension

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- It's possible to specify logging of the ServerLayer

- included memcached in buildout

- use openresty instead of nginx

- nailed versions of dependencies

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- Add MongoLayer

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- SMTPServerLayer's is now None before calling setUp()

- add additional tests for SMTPServerLayer

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- add missing __name__ to SMTPServerLayer