Birdhousebuilder.recipe.nginx

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* fixed ssl-key-length option (int value).

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* ssl-key-length option added.

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* create ``var/www`` folder.

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* enabled user in nginx.conf.
* using supervisor skip-user option.

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* enabled travis.
* updated buildout and doctests.
* added conda options env, pkgs, channels.
* using zc.recipe.deployment
* fail save with log message when cert generation fails.

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* added cryptography conda package.