Collective-recipe-buildoutcache

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- Nothing changed yet.

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- Fix way to get bool from a str.
[bsuttor]

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- Add preremove_old_work_dir option. You can now not delete work dir if a build failed.
[bsuttor]

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- Add timeout option
[bsuttor]

- Return code if bin/buildout do not work during construction of cache.
[bsuttor]

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- Package created using templer
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